SN54F299 Datasheet, PDF (1/7 Pages) Texas Instruments – 8-BIT UNIVERSAL SHIFT/STORAGE REGISTERS WITH 3-STATE OUTPUTS

SN54F299, SN74F299
8-BIT UNIVERSAL SHIFT/STORAGE REGISTERS
WITH 3-STATE OUTPUTS
SDFS071A – MARCH 1987 – REVISED OCTOBER 1993
• Four Modes of Operation:
Hold (Store)
Shift Right
Shift Left
Load Data
• Operates With Outputs Enabled or at High
Impedance
• 3-State Outputs Drive Bus Lines Directly
• Can Be Cascaded for N-Bit Word Lengths
• Direct Overriding Clear
• Applications:
Stacked or Push-Down Registers
Buffer Storage
Accumulator Registers
• Package Options Include Plastic
Small-Outline Packages, Ceramic Chip
Carriers, and Standard Plastic and Ceramic
300-mil DIPs
SN54F299 . . . J PACKAGE
SN74F299 . . . DW OR N PACKAGE
(TOP VIEW)
S0 1
OE1 2
OE2 3
G/Q_G 4
E/Q_E 5
C/Q_C 6
A/Q_A 7
Q_A′ 8
CLR 9
GND 10
20 V_CC
19 S1
18 SL
17 Q_H′
16 H/Q_H
15 F/Q_F
14 D/Q_D
13 B/Q_B
12 CLK
11 SR
SN54F299 . . . FK PACKAGE
(TOP VIEW)
description
These 8-bit universal shift /storage registers
feature multiplexed I/O ports to achieve full 8-bit
data handling in a single 20-pin package. Two
function-select (S0, S1) inputs and two
output-enable (OE1, OE2) inputs can be used to
choose the modes of operation listed in the
function table.
G/Q_G
E/Q_E
C/Q_C
A/Q_A
Q_A′
3 2 1 20 19
4
18
5
17
6
16
7
15
8
14
9 10 11 12 13
SL
Q_H′
H/Q_H
F/Q_F
D/Q_D
Synchronous parallel loading is accomplished by
taking both S0 and S1 high. This places the 3-state
outputs in a high-impedance state and permits
data that is applied on the I/O ports to be clocked into the register. Reading out of the register can be
accomplished while the outputs are enabled in any mode. Clearing occurs when the clear (CLR) input is low.
Taking either OE1 or OE2 high disables the outputs but has no effect on clearing, shifting, or storage of data.
The SN54F299 is characterized for operation over the full military temperature range of – 55°C to 125°C. The
SN74F299 is characterized for operation from 0°C to 70°C.
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.
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Copyright © 1993, Texas Instruments Incorporated
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