SN54AHC16374, SN74AHC16374
16-BIT EDGE-TRIGGERED D-TYPE FLIP-FLOPS
WITH 3-STATE OUTPUTS
SCLS330G – MARCH 1996 – REVISED JANUARY 2000
SN54AHC16374 . . . WD PACKAGE
SN74AHC16374 . . . DGG, DGV, OR DL PACKAGE
(TOP VIEW)
Members of the Texas Instruments
Widebus Family
EPIC (Enhanced-Performance Implanted
CMOS) Process
1OE
1Q1
1Q2
GND
1Q3
1Q4
1CLK
1
2
3
4
5
6
7
8
9
48
Operating Range 2-V to 5.5-V V
CC
47 1D1
46 1D2
45 GND
44 1D3
43 1D4
3-State Outputs Drive Bus Lines Directly
Distributed V and GND Pins Minimize
CC
High-Speed Switching Noise
Flow-Through Architecture Optimizes PCB
Layout
V
42
V
CC
CC
1Q5
1Q6
41 1D5
40 1D6
39 GND
38 1D7
37 1D8
36 2D1
35 2D2
34 GND
33 2D3
32 2D4
Latch-Up Performance Exceeds 250 mA Per
JESD 17
GND 10
1Q7 11
1Q8 12
2Q1 13
2Q2 14
GND 15
2Q3 16
2Q4 17
ESD Protection Exceeds 2000 V Per
MIL-STD-883, Method 3015; Exceeds 200 V
Using Machine Model (C = 200 pF, R = 0)
Package Options Include Plastic Shrink
Small-Outline (DL), Thin Shrink
Small-Outline (DGG), and Thin Very
Small-Outline (DGV) Packages and 380-mil
Fine-Pitch Ceramic Flat (WD) Package
Using 25-mil Center-to-Center Spacings
V
18
31
V
CC
CC
2Q5 19
2Q6 20
GND 21
2Q7 22
2Q8 23
2OE 24
30 2D5
29 2D6
28 GND
27 2D7
26 2D8
25 2CLK
description
The
’AHC16374
devices
are
16-bit
edge-triggered D-type flip-flops with 3-state
outputs designed specifically for driving highly
capacitive or relatively low-impedance loads.
They are particularly suitable for implementing
buffer registers, I/O ports, bidirectional bus
drivers, and working registers.
These devices can be used as two 8-bit flip-flops or one 16-bit flip-flop. On the positive transition of the clock
(CLK) input, the Q outputs of the flip-flop take on the logic levels at the data (D) inputs.
A buffered output-enable (OE) input can be used to place the eight outputs in either a normal logic state (high
or low logic levels) or the high-impedance state. In the high-impedance state, the outputs neither load nor drive
the bus lines significantly. The high-impedance state and the increased drive provide the capability to drive bus
lines without need for interface or pullup components.
To ensure the high-impedance state during power up or power down, OE should be tied to V through a pullup
CC
resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.
OE does not affect internal operations of the flip-flop. Old data can be retained or new data can be entered while
the outputs are in the high-impedance state.
The SN54AHC16374 is characterized for operation over the full military temperature range of –55°C to 125°C.
The SN74AHC16374 is characterized for operation from –40°C to 85°C.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
EPIC and Widebus are trademarks of Texas Instruments Incorporated.
Copyright 2000, Texas Instruments Incorporated
UNLESS OTHERWISE NOTED this document contains PRODUCTION
DATA information current as of publication date. Products conform to
specifications per the terms of Texas Instruments standard warranty.
Production processing does not necessarily include testing of all
parameters.
1
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