Datasheet

16-Bit Registers
CY74FCT16374T
CY74FCT162374T
SCCS055C - August 1994 - Revised September 2001
Data sheet acquired from Cypress Semiconductor Corporation.
Data sheet modified to remove devices not offered.
Copyright © 2001, Texas Instruments Incorporated
1CY74FCT162374T
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%
CY74FCT16374T Features:
• 64 mA sink current, 32 mA source current
• Typical V
OLP
(ground bounce) <1.0V at V
CC
= 5V,
T
A
= 25˚C
CY74FCT162374T 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
Functional Description
CY74FCT16374T and CY74FCT162374T are 16-bit D-type
registers designed for use as buffered registers in high-speed,
low power bus applications. These devices can be used as two
independent 8-bit registers or as a single 16-bit register by
connecting the output Enable (OE) and Clock (CLK) inputs.
Flow-through pinout and small shrink packaging aid in
simplifying board layout.
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 CY74FCT16374T is ideally suited for driving
high-capacitance loads and low-impedance backplanes.
The CY74FCT162374T 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
CY74FCT162374T is ideal for driving transmission lines.
Logic Block Diagrams Pin Configuration
D
C
1
OE
FCT162374-1
1
CLK
1
D
1
1
O
1
TO 7 OTHER CHANNELS
D
C
2
OE
FCT162374-2
2
CLK
2
D
1
2
O
1
FCT162374-3
GND
1
2
3
4
5
6
7
8
9
10
11
12
33
32
31
30
29
25
26
27
28
36
35
1
OE
34
SSOP/TSSOP
Top View
13
14
15
16
17
18
19
20
21
22
23
24
45
44
43
42
41
37
38
39
40
48
47
46
1
O
1
1
O
2
1
O
3
1
O
4
1
D
1
1
D
2
1
D
3
1
D
4
1
CLK
GND
GND
V
CC
1
O
7
1
O
8
1
O
5
1
O
6
1
D
5
1
D
6
1
D
7
1
D
8
V
CC
GND
GND
2
O
3
2
O
4
2
O
1
2
O
2
2
D
1
2
D
2
2
D
3
2
D
4
GND
GND
V
CC
2
O
7
2
O
8
2
O
5
2
O
6
2
D
5
2
D
6
2
D
7
2
D
8
V
CC
GND
2
OE
2
CLK
TO 7 OTHER CHANNELS