SN74BCT29826 Datasheet, PDF (1/7 Pages) Texas Instruments – 8-BIT BUS-INTERFACE FLIP-FLOPS WITH 3-STATE OUTPUTS

• State-of-the-Art BiCMOS Design
Significantly Reduces I_CCZ
• ESD Protection Exceeds 2000 V Per
MIL-STD-883C, Method 3015; Exceeds
200 V Using Machine Model (C = 200 pF,
R = 0)
• 3-State Inverting Buffer-Type Outputs Drive
Bus Lines Directly
• Package Options Include Plastic
Small-Outline (DW) Packages, Ceramic Chip
Carriers (FK) and Flatpacks (W), and
Standard Plastic and Ceramic 300-mil DIPs
(JT, NT)
description
These 8-bit bus-interface flip-flops feature 3-state
outputs designed specifically for driving highly
capacitive or relatively low-impedance loads.
They are particularly suitable for implementing
wider buffer registers, I/O ports, bidirectional bus
drivers with parity, and working registers.
The eight flip-flops are edge-triggered D-type
flip-flops. With the clock-enable (CLKEN) input
low, the device enters data on the low-to-high
transition of the clock. Taking CLKEN high
disables the clock buffer, thus latching the outputs.
Taking the clear (CLR) input low causes the eight
Q outputs to go low independently of the clock.
Buffered output-enable (OE1, OE2, or OE3)
inputs can be used to place the eight outputs in
either a normal logic state (high or low) or a
high-impedance state. In the high-impedance
state, the outputs neither load nor drive the bus
lines significantly. The high-impedance state and
increased drive provide the capability to drive bus
lines without need for interface or pullup
components.
The output-enable inputs do not affect the internal
operation of the flip-flops. Old data can be retained
or new data can be entered while the outputs are
in the high-impedance state.
The SN54BCT29826 is characterized for opera-
tion over the full military temperature range of
−55°C to 125°C. The SN74BCT29826 is
characterized for operation from 0°C to 70°C.
SN54BCT29826, SN74BCT29826
8ĆBIT BUSĆINTERFACE FLIPĆFLOPS
WITH 3ĆSTATE OUTPUTS
SCBS076A − NOVEMBER 1991 − REVISED NOVEMBER 1993
SN54BCT29826 . . . JT OR W PACKAGE
SN74BCT29826 . . . DW OR NT PACKAGE
(TOP VIEW)
OE1 1
OE2 2
1D 3
2D 4
3D 5
4D 6
5D 7
6D 8
7D 9
8D 10
CLR 11
GND 12
24 V_CC
23 OE3
22 1Q
21 2Q
20 3Q
19 4Q
18 5Q
17 6Q
16 7Q
15 8Q
14 CLKEN
13 CLK
SN54BCT29826 . . . FK PACKAGE
(TOP VIEW)
4 3 2 1 28 27 26
2D ⁵
25 2Q
3D ⁶
24 3Q
4D ⁷
23 4Q
NC ⁸
22 NC
5D ⁹
21 5Q
6D ¹⁰
20 6Q
7D ¹¹
19 7Q
12 13 14 15 16 17 18
NC − No internal connection
PRODUCTION DATA information is 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.
Copyright  1993, Texas Instruments Incorporated
• POST OFFICE BOX 655303 DALLAS, TEXAS 75265
• POST OFFICE BOX 1443 HOUSTON, TEXAS 77251−1443
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