IDT74ALVC162525
3.3V CMOS 18-BIT REGISTERED BUS TRANSCEIVER WITH 3-STATE OUTPUTS
INDUSTRIAL TEMPERATURE RANGE
3.3V CMOS 18-BIT REGIS-
TERED BUS TRANSCEIVER
WITH 3-STATE OUTPUTS
AND BUS-HOLD
FEATURES:
• 0.5 MICRON CMOS Technology
• Typical t
SK(o)
(Output Skew) < 250ps
• ESD > 2000V per MIL-STD-883, Method 3015; > 200V using
machine model (C = 200pF, R = 0)
• V
CC
= 3.3V ± 0.3V, Normal Range
• V
CC
= 2.7V to 3.6V, Extended Range
• V
CC
= 2.5V ± 0.2V
• CMOS power levels (0.4µ W typ. static)
µ
• Rail-to-Rail output swing for increased noise margin
• Available in SSOP, TSSOP, and TVSOP packages
IDT74ALVC162525
DESCRIPTION:
This 18-bit registered bus transceiver is built using advanced dual metal
CMOS technology. Data flow in each direction is controlled by output-enable
(OEAB and
OEBA)
and clock-enable (CLKENAB and
CLKENBA)
inputs. For
the A-to-B data flow, the data flows through a single register. The B-to-A data
can flow through a four-stage pipeline register path, or through a single register
path, depending on the state of the select (SEL) input. Data is stored in the internal
registers on the low-to-high transition of the clock (CLK) input, provided that the
appropriate
CLKEN
inputs are low. The A-to-B data transfer is synchronized
to the CLKAB input, and B-to-A data transfer is synchronized with the CLK1BA
and CLK2BA inputs.
The ALVCH162525 has series resistors in the device output structure of the
“B” port which will significantly reduce line noise when used with light loads. This
driver has been designed to drive ±12mA at the designated threshold levels.
The “A” port has a ±24mA driver.
To ensure the high-impedance state during power up or power down,
OE
should be tied to V
CC
through a pullup resistor; the minimum value of the resistor
is determined by the current-sinking capability of the driver.
The ALVCH162525 has “bus-hold” which retains the inputs’ last state
whenever the input bus goes to a high impedance. This prevents floating inputs
and eliminates the need for pull-up/down resistors.
DRIVE FEATURES:
• High Output Drivers: ±24mA (A port)
• Balanced Output Drivers: ±12mA (B port)
APPLICATIONS:
• 3.3V high speed systems
• 3.3V and lower voltage computing systems
FUNCTIONAL BLOCK DIAGRAM
CL
K AB
55
CLK 1BA
30
CLK 2BA
29
CLKE NBA
28
CLKE NAB
1
OEAB
2
OEBA
27
56
SEL
CE
C1
A
1
3
1
CE
C1
CE
C1
1D
CE
C1
1D
54
1D
0
1D
B
1
CE
C1
1D
1 of 18 Channels
To 17 O ther Channels
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
INDUSTRIAL TEMPERATURE RANGE
1
© 1999 Integrated Device Technology, Inc.
MARCH 1999
DSC-4220/1
IDT74ALVC162525
3.3V CMOS 18-BIT REGISTERED BUS TRANSCEIVER WITH 3-STATE OUTPUTS
INDUSTRIAL TEMPERATURE RANGE
PIN CONFIGURATION
CLKENAB
OEAB
A
1
GND
A
2
A
3
V
CC
A
4
A
5
A
6
GND
A
7
A
8
A
9
A
10
A
11
A
12
GND
A
13
A
14
A
15
V
CC
A
16
A
17
GND
A
18
OEBA
CLKENBA
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
56
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
SEL
CLKAB
B
1
GND
B
2
B
3
V
CC
B
4
B
5
B
6
GND
B
7
B
8
B
9
B
10
B
11
B
12
GND
B
13
B
14
B
15
V
CC
B
16
B
17
GND
B
18
CLK1BA
CLK2BA
ABSOLUTE MAXIMUM RATINGS
(1)
Symbol
Description
Max
–0.5 to +4.6
–0.5 to V
CC
+0.5
–65 to +150
–50 to +50
±50
–50
±100
Unit
V
V
°C
mA
mA
mA
mA
V
TERM
(2)
Terminal Voltage with Respect to GND
V
TERM
(3)
Terminal Voltage with Respect to GND
T
STG
I
OUT
I
IK
I
OK
I
CC
I
SS
Storage Temperature
DC Output Current
Continuous Clamp Current,
V
I
< 0 or V
I
> V
CC
Continuous Clamp Current, V
O
< 0
Continuous Current through each
V
CC
or GND
NOTES:
1. Stresses greater than those listed under ABSOLUTE MAXIMUM RATINGS 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. V
CC
terminals.
3. All terminals except V
CC
.
CAPACITANCE
(T
A
= +25°C, F = 1.0MHz)
Symbol
C
IN
C
OUT
C
OUT
Parameter
(1)
Input Capacitance
Output Capacitance
I/O Port Capacitance
Conditions
V
IN
= 0V
V
OUT
= 0V
V
IN
= 0V
Typ.
5
7
7
Max.
7
9
9
Unit
pF
pF
pF
NOTE:
1. As applicable to the device type.
PIN DESCRIPTION
Pin Names
CLKAB
CLK1BA
CLK2BA
CLKENBA
CLKENAB
Description
Clock Input for the A to B direction
Clock Input for the B to A pipeline register
Clock Input for the B to A output register
Clock Enable for the CLK1BA and CLK2BA clocks (Active LOW)
Clock Enable for the CLKAB clock (Active LOW)
Output Enable for the B port (Active LOW)
Output Enable for the A port (Active LOW)
Select pin for pipelined/non-pipelined mode in the B-to-A direction
(Active LOW)
Ax
Bx
A-to-B Data Inputs or B-to-A 3-State Outputs
(1)
B-to-A Data Inputs or A-to-B 3-State Outputs
(1)
SSOP/ TSSOP/ TVSOP
TOP VIEW
OEAB
OEBA
SEL
NOTE:
1. These pins have "Bus-Hold". All other pins are standard inputs, outputs, or I/Os.
2
IDT74ALVC162525
3.3V CMOS 18-BIT REGISTERED BUS TRANSCEIVER WITH 3-STATE OUTPUTS
INDUSTRIAL TEMPERATURE RANGE
FUNCTION TABLE
(1)
A-TO-B STORAGE (OEAB = L)
Inputs
CLKENAB
H
L
L
B-TO-A STORAGE (OEBA = L)
Outputs
Inputs
CLKENBA
H
L
L
L
L
CLK2BA
X
↑
↑
↑
↑
CLK1BA
X
X
X
↑
↑
SEL
X
H
H
L
L
Bx
X
L
H
L
H
Outputs
Ax
A
(2)
0
CLKAB
X
↑
↑
Ax
X
L
H
Bx
B
(2)
0
L
H
L
H
L
(3)
H
(3)
NOTES:
1. H = HIGH Voltage Level
L = LOW Voltage Level
X = Don’t Care
↑
= LOW-to-HIGH Transition
2. Output level before the indicated steady-state input conditions were established
3. Three CLK1BA edges and one CLK2BA edge are needed to propagate data from B
to A when
SEL
is low.
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified:
Operating Condition: T
A
= –40°C to +85°C
Symbol
V
IH
Parameter
Input HIGH Voltage Level
V
CC
= 2.3V to 2.7V
V
CC
= 2.7V to 3.6V
V
IL
I
IH
I
IL
I
OZH
I
OZL
V
IK
V
H
I
CCL
I
CCH
I
CCZ
∆I
CC
Input LOW Voltage Level
Input HIGH Current
Input LOW Current
High Impedance Output Current
(3-State Output pins)
Clamp Diode Voltage
Input Hysteresis
Quiescent Power Supply Current
V
CC
= 2.3V, I
IN
= –18mA
V
CC
= 3.3V
V
CC
= 3.6V
V
IN
= GND or V
CC
One input at V
CC
- 0.6V, other inputs at V
CC
or GND
V
CC
= 2.3V to 2.7V
V
CC
= 2.7V to 3.6V
V
CC
= 3.6V
V
CC
= 3.6V
V
CC
= 3.6V
V
I
= V
CC
V
I
= GND
V
O
= V
CC
V
O
= GND
Test Conditions
Min.
1.7
2
—
—
—
—
—
—
—
—
—
Typ.
(1)
—
—
—
—
—
—
—
—
–0.7
100
0.1
Max.
—
—
0.7
0.8
±5
±5
±10
±10
–1.2
—
40
V
mV
µA
µA
µA
µA
V
Unit
V
Quiescent Power Supply Current
Variation
—
—
750
µA
NOTE:
1. Typical values are at V
CC
= 3.3V, +25°C ambient.
3
IDT74ALVC162525
3.3V CMOS 18-BIT REGISTERED BUS TRANSCEIVER WITH 3-STATE OUTPUTS
INDUSTRIAL TEMPERATURE RANGE
BUS-HOLD CHARACTERISTICS
Symbol
I
BHH
I
BHL
I
BHH
I
BHL
I
BHHO
I
BHLO
NOTES:
1. Pins with Bus-Hold are identified in the pin description.
2. Typical values are at V
CC
= 3.3V, +25°C ambient.
Parameter
(1)
Bus-Hold Input Sustain Current
Bus-Hold Input Sustain Current
Bus-Hold Input Overdrive Current
V
CC
= 3V
V
CC
= 2.3V
V
CC
= 3.6V
Test Conditions
V
I
= 2V
V
I
= 0.8V
V
I
= 1.7V
V
I
= 0.7V
V
I
= 0 to 3.6V
Min.
– 75
75
– 45
45
—
Typ.
(2)
—
—
—
—
—
Max.
—
—
—
—
±500
Unit
µA
µA
µA
OUTPUT DRIVE CHARACTERISTICS (A PORT)
Symbol
V
OH
Parameter
Output HIGH Voltage
V
CC
= 2.3V
V
CC
= 2.3V
V
CC
= 2.7V
V
CC
= 3V
V
CC
= 3V
V
OL
Output LOW Voltage
V
CC
= 2.3V to 3.6V
V
CC
= 2.3V
V
CC
= 2.7V
V
CC
= 3V
I
OH
= – 24mA
I
OL
= 0.1mA
I
OL
= 6mA
I
OL
= 12mA
I
OL
= 12mA
I
OL
= 24mA
Test Conditions
(1)
V
CC
= 2.3V to 3.6V
I
OH
= – 0.1mA
I
OH
= – 6mA
I
OH
= – 12mA
Min.
V
CC
– 0.2
2
1.7
2.2
2.4
2
—
—
—
—
—
Max.
—
—
—
—
—
—
0.2
0.4
0.7
0.4
0.55
V
Unit
V
NOTE:
1. V
IH
and V
IL
must be within the min. or max. range shown in the DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE table for the appropriate V
CC
range.
T
A
= – 40°C to + 85°C.
OUTPUT DRIVE CHARACTERISTICS (B PORT)
Symbol
V
OH
Parameter
Output HIGH Voltage
V
CC
= 2.3V
V
CC
= 2.7V
V
CC
= 3V
V
OL
Output LOW Voltage
V
CC
= 2.3V to 3.6V
V
CC
= 2.3V
V
CC
= 2.7V
V
CC
= 3V
Test Conditions
(1)
V
CC
= 2.3V to 3.6V
I
OH
= – 0.1mA
I
OH
= – 4mA
I
OH
= – 6mA
I
OH
= – 4mA
I
OH
= – 8mA
I
OH
= – 6mA
I
OH
= – 12mA
I
OL
= 0.1mA
I
OL
= 4mA
I
OL
= 6mA
I
OL
= 4mA
I
OL
= 8mA
I
OL
= 6mA
I
OL
= 12mA
Min.
V
CC
– 0.2
1.9
1.7
2.2
2
2.4
2
—
—
—
—
—
—
—
Max.
—
—
—
—
—
—
—
0.2
0.4
0.55
0.4
0.6
0.55
0.8
V
Unit
V
NOTE:
1. V
IH
and V
IL
must be within the min. or max. range shown in the DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE table for the appropriate V
CC
range.
T
A
= – 40°C to + 85°C.
4
IDT74ALVC162525
3.3V CMOS 18-BIT REGISTERED BUS TRANSCEIVER WITH 3-STATE OUTPUTS
INDUSTRIAL TEMPERATURE RANGE
OPERATING CHARACTERISTICS, T
A
= 25°C
V
CC
= 2.5V ± 0.2V
Symbol
C
PD
C
PD
Parameter
Power Dissipation Capacitance Outputs enabled
Power Dissipation Capacitance Outputs disabled
Test Conditions
C
L
= 0pF, f = 10Mhz
Typical
V
CC
= 3.3V ± 0.3V
Typical
160
160
Unit
pF
—
—
SWITCHING CHARACTERISTICS (FOR A AND B PORTS)
(1)
V
CC
= 2.5V ± 0.2V
Symbol
f
MAX
t
PLH
t
PHL
t
PLH
t
PHL
t
PZH
t
PZL
t
PZH
t
PZL
t
PHZ
t
PLZ
t
PHZ
t
PLZ
t
SU
t
SU
t
SU
t
SU
t
SU
t
SU
t
SU
t
H
t
H
t
H
t
H
t
H
t
H
t
H
t
W
t
SK(O)
Propagation Delay
CLKAB to 2Bx
Propagation Delay
CLK2BA to Ax
Output Enable Time
OEAB
to Bx
Output Enable Time
OEBA
to Ax
Output Disable Time
OEAB
to Bx
Output Disable Time
OEBA
to Ax
Set-up Time, Ax data before CLKAB↑
Set-up Time, Bx data before CLK2BA↑
Set-up Time, Bx data before CLK1BA↑
Set-up Time,
SEL
before CLK2BA↑
Set-up Time,
CLKENAB
before CLKAB↑
Set-up Time,
CLKENBA
before CLK1BA↑
Set-up Time,
CLKENBA
before CLK2BA↑
Hold Time, Ax data after CLKAB↑
Hold Time, Bx data before CLK2BA↑
Hold Time, Bx data before CLK1BA↑
Hold Time,
SEL
before CLK2BA↑
Hold Time,
CLKENAB
before CLKAB↑
Hold Time,
CLKENBA
before CLK1BA↑
Hold Time,
CLKENBA
before CLK2BA↑
Pulse Duration, CLK HIGH or LOW
Output Skew
(2)
1.3
2.1
1.3
3.3
2.1
2.7
2.7
0.7
0.4
0.8
0
0.1
0
0
3.2
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
1.3
1.8
1.2
3.3
1.9
2.5
2.5
0.4
0
0.4
0
0.3
0
0
3.2
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
1.3
1.7
1.1
3.3
1.6
2.1
2.2
0.9
0.6
1
0.1
0.3
0.1
0
3
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
500
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ps
1
6.3
—
5.4
1
4.9
ns
1
6.3
—
5.4
1
4.9
ns
1
6.1
—
6.1
1
5.1
ns
1
6.7
—
6.8
1
5.7
ns
1
4.5
—
4.4
1
4.2
ns
Parameter
Min.
120
1
Max.
—
5.5
V
CC
= 2.7V
Min.
125
—
Max.
—
5.4
V
CC
= 3.3V ± 0.3V
Min.
150
1
Max.
—
4.7
Unit
MHz
ns
NOTES:
1. See TEST CIRCUITS AND WAVEFORMS. T
A
= – 40°C to + 85°C.
2. Skew between any two outputs of the same package and switching in the same direction.
5
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