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Data sheet acquired from Cypress Semiconductor Corporation.
Data sheet modified to remove devices not offered.
CY74FCT16646T
CY74FCT162646T
SCCS060B - August 1994 - Revised September 2001
16-Bit Registered Transceivers
Functional Description
The CY74FCT16646T and CY74FCT162646T 16-bit
transceivers are three-state, D-type registers, and control
circuitry arranged for multiplexed transmission of data directly
from the input bus or from the internal registers. Data on the A
or B bus will be clocked into the registers as the appropriate
clock pin goes to a HIGH logic level. Output Enable (OE) and
direction pins (DIR) are provided to control the transceiver
function. In the transceiver mode, data present at the high
impedance port may be stored in either the A or B register, or
in both. The select controls can multiplex stored and real-time
(transparent mode) data. The direction control determines
which bus will receive data when the Output Enable (OE) is
Active LOW. In the isolation mode (Output Enable (OE) HIGH),
A data may be stored in the B register and/or B data may be
stored in the A register.
This device is fully specified for partial-power-down
applications using I
off
. The I
off
circuitry disables the outputs,
preventing damaging current backflow through the device
when it is powered down.
The CY74FCT16646T is ideally suited for driving
high-capacitance loads and low-impedance backplanes.
The CY74FCT162646T has 24-mA balanced output drivers
with current limiting resistors in the outputs. This reduces the
need for external terminating resistors and provides for
minimal undershoot and reduced ground bounce. The
CY74FCT162646T is ideal for driving transmission lines.
Features
• I
off
supports partial-power-down mode operation
• Edge-rate control circuitry for significantly improved
noise characteristics
• Typical output skew < 250 ps
• ESD > 2000V
• TSSOP (19.6-mil pitch) and SSOP (25-mil pitch)
packages
• Industrial temperature range of
−40˚C
to +85˚C
• V
CC
= 5V
±
10%
CY74FCT16646T Features:
• 64 mA sink current, 32 mA source current
• Typical V
OLP
(ground bounce) <1.0V at V
CC
= 5V,
T
A
= 25˚C
CY74FCT162646T Features:
• Balanced 24 mA output drivers
• Reduced system switching noise
• Typical V
OLP
(ground bounce) <0.6V at V
CC
= 5V,
T
A
= 25˚C
Logic Block Diagrams
1OE
1DIR
1CLKBA
1SBA
1CLKAB
1SAB
B REG
D
C
2A1
1A1
A REG
D
C
1B1
2OE
2DIR
2CLKBA
2SBA
2CLKAB
2SAB
B REG
D
C
A REG
D
C
2B1
TO 7 OTHER CHANNELS
TO 7 OTHER CHANNELS
FCT16646-1
FCT16646-2
Copyright
©
2001, Texas Instruments Incorporated
CY74FCT16646T
CY74FCT162646T
Pin Configuration
SSOP/TSSOP
Top View
1DIR
1CLKAB
1SAB
GND
1A1
1A2
VCC
1A3
1A4
1A5
GND
1A6
1A7
1A8
2A1
2A2
2A3
GND
2A4
2A5
2A6
VCC
2A7
2A8
GND
2SAB
2CLKAB
2DIR
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
1OE
1CLKBA
1SBA
GND
1B1
1B2
VCC
1B3
1B4
1B5
GND
1B6
1B7
1B8
2B1
2B2
2B3
GND
2B4
2B5
2B6
VCC
2B7
2B8
GND
2SBA
2CLKBA
2OE
FCT16646-3
Pin Description
Pin Names
A
B
CLKAB, CLKBA
SAB, SBA
DIR
OE
Data Register A Inputs
Data Register B Outputs
Data Register B Inputs
Data Register A Outputs
Clock Pulse Inputs
Output Data Source Select Inputs
Direction
Output Enable (Active LOW)
Description
2
CY74FCT16646T
CY74FCT162646T
Function Table
[1]
Inputs
OE
H
H
L
L
L
L
DIR
X
X
L
L
H
H
CLKAB
H or L
X
X
X
H or L
CLKBA
H or L
X
H or L
X
X
SAB
X
X
X
X
L
H
SBA
X
X
L
H
X
X
Data I/O
[2]
A
Input
Output
Input
B
Input
Input
Function
Isolation
Store A and B Data
Real Time B Data to A Bus
Stored B Data to A Bus
Output Real Time A Data to Bus
Stored A Data to B Bus
BUS A
BUS B
BUS A
BUS B
DIR
L
OE
L
CLKAB
X
CLKBA
X
SAB
X
SBA
L
DIR
H
OE
L
CLKAB
X
CLKBA
X
SAB
L
SBA
X
Real-Time Transfer
Bus B to BusA
Real-Time Transfer
BusA to Bus B
BUS A
BUS B
BUS A
BUS A
DIR
H
L
X
OE
L
L
H
CLKAB
X
CLKBA
X
SAB
X
X
X
SBA
X
X
X
DIR
[3]
L
H
OE
L
L
CLKAB
X
H or L
CLKBA
H or L
X
SAB
X
H
SBA
H
X
Storage from
A and/or B
Transfer Stored Data
to A and/or B
Notes:
1.
2.
3.
= LOW-to-HIGH Transition
H = HIGH Voltage Level. L = LOW Voltage Level. X = Don’t Care
The data output functions may be enabled or disabled by various signals at the OE or DIR inputs. Data input functions are always enabled, i.e., data at the
bus pins will be stored on every LOW-to-HIGH transition on the clock inputs.
Cannot transfer data to A-bus and B-bus simultaneously.
.
3
CY74FCT16646T
CY74FCT162646T
Maximum Ratings
[4]
(Above which the useful life may be impaired. For user guide-
lines, not tested.)
Storage Temperature .....................Com’l
−55°C
to +125°C
Ambient Temperature with
Power Applied .................................Com’l
−55°C
to +125°C
DC Input Voltage
.................................................−0.5V
to +7.0V
DC Output Voltage
..............................................−0.5V
to +7.0V
DC Output Current
(Maximum Sink Current/Pin)
...........................−60
to +120 mA
Power Dissipation .......................................................... 1.0W
Static Discharge Voltage............................................>2001V
(per MIL-STD-883, Method 3015)
Operating Range
Range
Industrial
Ambient
Temperature
−40°C
to +85°C
V
CC
5V
±
10%
Electrical Characteristics
Over the Operating Range
Parameter
V
IH
V
IL
V
H
V
IK
I
IH
I
IL
I
OZH
I
OZL
I
OS
I
O
I
OFF
Description
Input HIGH Voltage
Input LOW Voltage
Input Hysteresis
[6]
Input Clamp Diode Voltage
Input HIGH Current
Input LOW Current
High Impedance Output Current
(Three-State Output pins)
High Impedance Output Current
(Three-State Output pins)
Short Circuit Current
[7]
Output Drive Current
[7]
Power-Off Disable
V
CC
=Min., I
IN
=−18 mA
V
CC
=Max., V
I
=V
CC
V
CC
=Max., V
I
=GND
V
CC
=Max., V
OUT
=2.7V
V
CC
=Max., V
OUT
=0.5V
V
CC
=Max., V
OUT
=GND
V
CC
=Max., V
OUT
=2.5V
V
CC
=0V, V
OUT
≤4.5V
[9]
−80
−50
−140
100
−0.7
−1.2
±1
±1
±1
±1
−200
−180
±1
Test Conditions
Min.
2.0
0.8
Typ.
[5]
Max.
Unit
V
V
mV
V
µA
µA
µA
µA
mA
mA
µA
Output Drive Characteristics for CY74FCT16646T
Parameter
V
OH
Description
Output HIGH Voltage
Test Conditions
V
CC
=Min., I
OH
=−3 mA
V
CC
=Min., I
OH
=−15 mA
V
CC
=Min., I
OH
=−32 mA
V
OL
Output LOW Voltage
V
CC
=Min., I
OL
=64 mA
Min.
2.5
2.4
2.0
Typ.
[5]
3.5
3.5
3.0
0.2
0.55
Max.
Unit
V
V
V
V
Output Drive Characteristics for CY74FCT162646T
Parameter
I
ODL
I
ODH
V
OH
V
OL
Description
Output LOW Current
[7]
Output HIGH Current
[7]
Output HIGH Voltage
Output LOW Voltage
Test Conditions
V
CC
=5V, V
IN
=V
IH
or V
IL
, V
OUT
=1.5V
V
CC
=5V, V
IN
=V
IH
or V
IL
, V
OUT
=1.5V
V
CC
=Min., I
OH
=−24 mA
V
CC
=Min., I
OL
=24 mA
Min.
60
−60
2.4
Typ.
[5]
115
−115
3.3
0.3
0.55
Max.
150
−150
Unit
mA
mA
V
V
Notes:
4. Stresses greater than those listed under 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.
5. Typical values are at V
CC
= 5.0V, T
A
= +25˚C ambient.
6. This parameter is specified but not tested.
7. Not more than one output should be shorted at a time. Duration of short should not exceed one second. The use of high-speed test apparatus and/or sample
and hold techniques are preferable in order to minimize internal chip heating and more accurately reflect operational values. Otherwise prolonged shorting of
a high output may raise the chip temperature well above normal and thereby cause invalid readings in other parametrics tests. In any sequence of parameter
tests, I
OS
tests should be performed last.
8. This parameter is measured at characterization but not tested.
9. Tested at +25˚C.
4
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