Integrated Device Technology, Inc.
FAST CMOS 16-BIT
BIDIRECTIONAL
TRANSCEIVERS
IDT54/74FCT16245T/AT/CT/ET
IDT54/74FCT162245T/AT/CT/ET
IDT54/74FCT166245T/AT/CT
IDT54/74FCT162H245T/AT/CT/ET
FEATURES:
• Common features:
– 0.5 MICRON CMOS Technology
– High-speed, low-power CMOS replacement for
ABT functions
–
Typical t
SK
(o) (Output Skew) < 250ps
– Low input and output leakage
≤
1µA (max.)
– ESD > 2000V per MIL-STD-883, Method 3015;
> 200V using machine model (C = 200pF, R = 0)
– Packages include 25 mil pitch SSOP, 19.6 mil pitch
TSSOP, 15.7 mil pitch TVSOP and 25 mil pitch Cerpack
– Extended commercial range of -40°C to +85°C
• Features for FCT16245T/AT/CT/ET:
– High drive outputs (-32mA I
OH
, 64mA I
OL
)
– Power off disable outputs permit “live insertion”
– Typical V
OLP
(Output Ground Bounce) < 1.0V at
V
CC
= 5V, T
A
= 25°C
• Features for FCT162245T/AT/CT/ET:
– Balanced Output Drivers:
±24mA
(commercial),
±16mA
(military)
– Reduced system switching noise
– Typical V
OLP
(Output Ground Bounce) < 0.6V at
V
CC
= 5V,T
A
= 25°C
DESCRIPTION:
The 16-bit transceivers are built using advanced dual metal
CMOS technology. These high-speed, low-power transceiv-
ers are ideal for synchronous communication between two
busses (A and B). The Direction and Output Enable controls
operate these devices as either two independent 8-bit trans-
ceivers or one 16-bit transceiver. The direction control pin
(xDIR) controls the direction of data flow. The output enable
pin (x
OE
) overrides the direction control and disables both
ports. All inputs are designed with hysteresis for improved
noise margin.
The FCT16245T are ideally suited for driving high-capaci-
tance loads and low-impedance backplanes. The output buff-
ers are designed with power off disable capability to allow "live
insertion" of boards when used as backplane drivers.
The FCT162245T have balanced output drive with current
limiting resistors. This offers low ground bounce, minimal
undershoot, and controlled output fall times– reducing the
need for external series terminating resistors. The
FCT162245T are plug-in replacements for the FCT16245T
and ABT16245 for on-board interface applications.
The FCT166245T are suited for very low noise, point-to-
point driving where there is a single receiver, or a light lumped
FUNCTIONAL BLOCK DIAGRAM
1
DIR
1
OE
1
A
1
1
B
1
1
A
2
1
B
2
1
A
3
1
B
3
1
A
4
1
B
4
1
A
5
1
B
5
1
A
6
1
B
6
1
A
7
1
B
7
1
A
8
1
B
8
2545 drw 01
2
DIR
2
OE
2
A
1
2
B
1
2
A
2
2
B
2
2
A
3
2
B
3
2
A
4
2
B
4
2
A
5
2
B
5
2
A
6
2
B
6
2
A
7
2
B
7
2
A
8
2
B
8
2545 drw 02
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
MILITARY AND COMMERCIAL TEMPERATURE RANGES
©1996
Integrated Device Technology, Inc.
AUGUST 1996
DSC-2545/9
5.3
1
IDT54/74FCT16245T/AT/CT/ET, 162245T/AT/CT/ET, IDT54/74FCT166245T/AT/CT, IDT54/74FCT162H245T/AT/CT/ET
FAST CMOS 16-BIT BIDIRECTIONAL TRANSCEIVERS
MILITARY AND COMMERCIAL TEMPERATURE RANGES
FEATURES: (Cont'd.)
• Features for FCT166245T/AT/CT:
– Light Drive A Port:
±8mA
(commercial),
±6mA
(military)
– High Drive B Port: +64mA, –32mA (commercial),
+48mA, –24mA (military)
– Minimal system switching noise
– Typical V
OLP
(Output Ground Bounce) < 0.25V at
V
CC
= 5V,T
A
= 25°C (A Port Switching)
• Features for FCT162H245T/AT/CT/ET:
– Bus Hold retains last active bus state during 3-state
– Eliminates the need for external pull up resistors
DESCRIPTION: (Cont'd.)
load (<100pF). The buffers are designed to limit the output
current to levels which will avoid noise and ringing on the
signal lines without using external series terminating resis-
tors. These parts have a
±8mA
driver on the "A" Port and a
+64/–32mA driver on the "B" Port, making them ideal for
interfacing noisy system busses to noise sensitive interfaces.
The FCT162H245T have "Bus Hold" which retains the
input's last state whenever the input goes to high impedance.
This prevents "floating" inputs and eliminates the need for
pull-up/down resistors.
PIN CONFIGURATIONS
1
DIR
1
B
1
1
B
2
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
48
47
46
45
44
43
42
41
40
39
38
SO48-1 37
SO48-2
SO48-3 36
35
34
33
32
31
30
29
28
27
26
25
1
OE
1
A
1
1
A
2
1
DIR
1
B
1
1
B
2
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
E48-1
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
2545 drw 04
1
OE
1
A
1
1
A
2
GND
1
B
3
1
B
4
GND
1
A
3
1
A
4
GND
1
B
3
1
B
4
GND
1
A
3
1
A
4
V
CC
1
B
5
1
B
6
V
CC
1
A
5
1
A
6
V
CC
1
B
5
1
B
6
V
CC
1
A
5
1
A
6
GND
1
B
7
1
B
8
2
B
1
2
B
2
GND
1
A
7
1
A
8
2
A
1
2
A
2
GND
1
B
7
1
B
8
2
B
1
2
B
2
GND
1
A
7
1
A
8
2
A
1
2
A
2
GND
2
B
3
2
B
4
GND
2
A
3
2
A
4
GND
2
B
3
2
B
4
GND
2
A
3
2
A
4
V
CC
2
B
5
2
B
6
V
CC
2
A
5
2
A
6
V
CC
2
B
5
2
B
6
V
CC
2
A
5
2
A
6
GND
2
B
7
2
B
8
2
DIR
GND
2
A
7
2
A
8
2
OE
2545 drw 03
GND
2
B
7
2
B
8
2
DIR
GND
2
A
7
2
A
8
2
OE
SSOP/
TSSOP/TVSOP
TOP VIEW
CERPACK
TOP VIEW
5.3
2
IDT54/74FCT16245T/AT/CT/ET, 162245T/AT/CT/ET, IDT54/74FCT166245T/AT/CT, IDT54/74FCT162H245T/AT/CT/ET
FAST CMOS 16-BIT BIDIRECTIONAL TRANSCEIVERS
MILITARY AND COMMERCIAL TEMPERATURE RANGES
PIN DESCRIPTION
Pin Names
x
OE
xDIR
xAx
xBx
Description
Output Enable Input (Active LOW)
Direction Control Input
Side A Inputs or 3-State Outputs
(1,2)
Side B Inputs or 3-State Outputs
(1,3)
FUNCTION TABLE
(1)
Inputs
x
OE
L
L
H
xDIR
L
H
X
Outputs
Bus B Data to Bus A
Bus A Data to Bus B
High Z State
2545 tbl 02
2545 tbl 01
NOTES:
1. On FCT162H245T these pins have “Bus Hold”. All other pins are standard
inputs, outputs or I/Os.
2. On FCT166245T this is the
±8mA
Port.
3. On FCT166245T this is the +64/–32mA Port.
NOTE:
1. H = HIGH Voltage Level
L = LOW Voltage Level
X = Don't Care
Z = High Impedance
ABSOLUTE MAXIMUM RATINGS
(1)
Symbol
Description
Max.
V
TERM(2)
Terminal Voltage with Respect to –0.5 to +7.0
GND
V
TERM(3)
Terminal Voltage with Respect to
–0.5 to
GND
V
CC
+0.5
T
STG
Storage Temperature
–65 to +150
I
OUT
DC Output Current
–60 to +120
Unit
V
V
°C
mA
CAPACITANCE
(T
A
= +25°C, f = 1.0MHz)
Symbol
Parameter
(1)
C
IN
Input
Capacitance
C
I/O
I/O
Capacitance
Conditions
V
IN
= 0V
V
OUT
= 0V
Typ.
3.5
3.5
Max. Unit
6.0
pF
8.0
pF
2545 lnk 04
NOTE:
1. This parameter is measured at characterization but not tested.
2545 lnk 03
NOTES:
1. Stresses greater than those listed under ABSOLUTE MAXIMUM RAT-
INGS may cause permanent damage to the device. This is a stress rating
only and functional operation of the device at these or any other conditions
above those indicated in the operational sections of this specification is
not implied. Exposure to absolute maximum rating conditions for
extended periods may affect reliability.
2. All device terminals except FCT162XXXT and FCT166XXXT (A-Port)
Output and I/O terminals.
3. Output and I/O terminals for FCT162XXXT and FCT166XXXT (A-Port).
5.3
3
IDT54/74FCT16245T/AT/CT/ET, 162245T/AT/CT/ET, IDT54/74FCT166245T/AT/CT, IDT54/74FCT162H245T/AT/CT/ET
FAST CMOS 16-BIT BIDIRECTIONAL TRANSCEIVERS
MILITARY AND COMMERCIAL TEMPERATURE RANGES
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE (STANDARD PARTS)
Following Conditions Apply Unless Otherwise Specified:
Commercial: T
A
=–40°C to +85°C, V
CC
= 5.0V
±
10%; Military: T
A
= –55°C to +125°C, V
CC
= 5.0V
±
10%
Symbol
V
IH
V
IL
I
I H
I
I L
I
OZH
I
OZL
V
IK
I
OS
V
H
I
CCL
I
CCH
I
CCZ
Parameter
Input HIGH Level
Input LOW Level
Input HIGH Current (Input pins)
(5)
Input HIGH Current (I/O pins)
(5)
Input LOW Current (Input pins)
(5)
Input LOW Current (I/O pins)
(5)
High Impedance Output Current
(3-State Output pins)
(5)
Clamp Diode Voltage
Short Circuit Current
Input Hysteresis
Quiescent Power Supply Current
V
CC
= Min., I
IN
= –18mA
V
CC
= Max., V
O
= GND
(3)
—
Test Conditions
(1)
Guaranteed Logic HIGH Level
Guaranteed Logic LOW Level
V
CC
= Max.
V
I
= V
CC
V
I
= GND
V
CC
= Max.
V
O
= 2.7V
V
O
= 0.5V
Min.
2.0
—
—
—
—
—
—
—
—
–80
—
—
Typ.
(2)
—
—
—
—
—
—
—
—
–
0.7
–
140
Max.
—
Unit
V
V
µA
0.8
±1
±1
±1
±1
±1
±1
–
1.2
–
225
—
µA
V
mA
mV
µA
100
5
V
CC
= Max., V
IN
= GND or V
CC
500
2545 lnk 05
OUTPUT DRIVE CHARACTERISTICS FOR FCT16245T AND FCT166245T (B-PORT)
Symbol
I
O
V
OH
Parameter
Output Drive Current
Output HIGH Voltage
Test Conditions
(1)
V
CC
= Max., V
O
= 2.5V
(3)
V
CC
= Min.
V
IN
= V
IH
or V
IL
I
OH
= –3mA
I
OH
= –12mA MIL.
I
OH
= –15mA COM'L.
I
OH
= –24mA MIL.
I
OH
= –32mA COM'L.
(4)
I
OL
= 48mA MIL.
I
OL
= 64mA COM'L.
≤
4.5V
Min.
–50
2.5
2.4
2.0
—
—
Typ.
(2)
—
Max.
–
180
—
—
—
0.55
±1
Unit
mA
V
V
V
V
µA
2545 lnk 06
3.5
3.5
3.0
0.2
—
V
OL
I
OFF
Output LOW Voltage
Input/Output Power Off Leakage
(5)
V
CC
= Min.
V
IN
= V
IH
or V
IL
V
CC
= 0V, V
IN
or V
O
OUTPUT DRIVE CHARACTERISTICS FOR FCT162245T
Symbol
I
ODL
I
ODH
V
OH
V
OL
Parameter
Output LOW Current
Output HIGH Current
Output HIGH Voltage
Output LOW Voltage
Test Conditions
(1)
V
CC
= 5V, V
IN
= V
IH
or V
IL,
V
OUT
= 1.5V
(3)
V
CC
= 5V, V
IN
= V
IH
or V
IL,
V
OUT
= 1.5V
(3)
V
CC
= Min.
V
IN
= V
IH
or V
IL
V
CC
= Min.
V
IN
= V
IH
or V
IL
I
OH
= –16mA MIL.
I
OH
= –24mA COM'L.
I
OL
= 16mA MIL.
I
OL
= 24mA COM'L.
Min.
60
–60
2.4
—
Typ.
(2)
115
–115
3.3
0.3
Max.
200
–200
—
0.55
Unit
mA
mA
V
V
2545 lnk 07
OUTPUT DRIVE CHARACTERISTICS FOR FCT166245T (A-PORT ONLY)
ON
TI
MA
OR
INF
CE
AN
DV
A
Symbol
I
ODL
I
ODH
V
OH
V
OL
Parameter
Output LOW Current
Output HIGH Current
Output HIGH Voltage
Output LOW Voltage
Test Conditions
(1)
V
CC
= 5V, V
IN
= V
IH
or V
IL,
V
OUT
= 1.5V
(3)
V
CC
= 5V, V
IN
= V
IH
or V
IL,
V
OUT
= 1.5V
(3)
V
CC
= Min.
V
IN
= V
IH
or V
IL
V
CC
= Min.
V
IN
= V
IH
or V
IL
I
OH
= –6mA MIL.
I
OH
= –8mA COM'L.
I
OL
= 6mA MIL.
I
OL
= 8mA COM'L.
Min.
16
–16
2.4
—
Typ.
(2)
48
–48
3.3
0.3
Max.
96
–96
—
0.55
Unit
mA
mA
V
V
2545 lnk 08
NOTES:
1. For conditions shown as Max. or Min., use appropriate value specified under Electrical Characteristics for the applicable device type.
2. Typical values are at Vcc = 5.0V, +25°C ambient.
3. Not more than one output should be tested at one time. Duration of the test should not exceed one second.
4. Duration of the condition can not exceed one second.
5. The test limit for this parameter is
±
5µA at T
A
= –55°C.
5.3
4
IDT54/74FCT16245T/AT/CT/ET, 162245T/AT/CT/ET, IDT54/74FCT166245T/AT/CT, IDT54/74FCT162H245T/AT/CT/ET
FAST CMOS 16-BIT BIDIRECTIONAL TRANSCEIVERS
MILITARY AND COMMERCIAL TEMPERATURE RANGES
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE (BUS HOLD)
Following Conditions Apply Unless Otherwise Specified:
Commercial: T
A
=–40°C to +85°C, V
CC
= 5.0V
±
10%; Military: T
A
= –55°C to +125°C, V
CC
= 5.0V
±
10%
Symbol
V
IH
V
IL
I
I H
Parameter
Input HIGH Level
Input LOW Level
Input
HIGH
Current
(4)
I
I L
Input
LOW
Current
(4)
I
BHH
I
BHL
I
OZH
I
OZL
V
IK
I
OS
V
H
I
CCL
I
CCH
I
CCZ
Bus Hold
Standard Input
(5)
Standard I/O
(5)
Bus Hold Input
Bus Hold I/O
Standard Input
(5)
Standard I/O
(5)
Bus Hold Input
Bus Hold I/O
Bus Hold Input
V
CC
= Min.
V
I
= 2.0V
V
I
= 0.8V
V
CC
= Max.
V
CC
= Min., I
IN
= –18mA
V
CC
= Max., V
O
= GND
(3)
—
Test Conditions
(1)
Guaranteed Logic HIGH Level
Guaranteed Logic LOW Level
V
CC
= Max.
V
I
= V
CC
Min.
2.0
—
—
—
—
—
Typ.
(2)
—
—
—
—
—
—
—
—
—
—
—
—
—
—
–
0.7
–
140
Max.
—
Unit
V
V
0.8
±
1
±
1
±
100
±
100
±
1
±
1
±
100
±
100
—
—
µ
A
V
I
= GND
—
—
—
—
–50
+50
—
—
—
–80
—
—
µ
A
Sustain
Current
(4)
High Impedance Output Current
(3-State Output pins)
(5,6)
Clamp Diode Voltage
Short Circuit Current
Input Hysteresis
Quiescent Power Supply Current
V
O
= 2.7V
V
O
= 0.5V
±
1
±
1
–
1.2
–
225
—
µ
A
V
mA
mV
100
5
V
CC
= Max., V
IN
= GND or V
CC
500
µ
A
NOTES:
1. For conditions shown as Max. or Min., use appropriate value specified under Electrical Characteristics for the applicable device type.
2. Typical values are at Vcc = 5.0V, +25°C ambient.
3. Not more than one output should be tested at one time. Duration of the test should not exceed one second.
4. Pins with Bus Hold are identified in the pin description.
5. The test limit for this parameter is
±
5µA at T
A
= –55°C.
6. Does not include Bus Hold I/O pins.
2545 lnk 09
5.3
5
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