SN54AS194_14 Datasheet, PDF (1/17 Pages) Texas Instruments – 4-BIT BIDIRECTIONAL UNIVERSAL SHIFT REGISTERS

ą
SN54AS194, SN74AS194
4ĆBIT BIDIRECTIONAL UNIVERSAL SHIFT REGISTERS
ą
SDAS212A − DECEMBER 1983 − REVISED DECEMBER 1994
• Parallel-to-Serial, Serial-to-Parallel
Conversions
• Left or Right Shifts
• Parallel Synchronous Loading
• Direct Overriding Clear
• Temporary Data-Latching Capability
• Package Options Include Plastic
Small-Outline Packages (D), Ceramic Chip
Carriers (FK), and Standard Plastic (N) and
Ceramic (J) 300-mil DIPs
SN54AS194 . . . J PACKAGE
SN74AS194 . . . D OR N PACKAGE
(TOP VIEW)
CLR ¹
SR SER ²
A³
B⁴
C5
D6
SL SER 7
GND 8
16 _VCC
15 _QA
14 _QB
13 _QC
12 Q_D
11 CLK
10 S1
9 S0
description
These 4-bit bidirectional universal shift registers
feature parallel outputs, right-shift and left-shift
serial (SR SER, SL SER) inputs, operating-
mode-control (S0, S1) inputs, and a direct
overriding clear (CLR) line. The registers have
four distinct modes of operation:
• Inhibit clock (temporary data latch/do nothing)
• Shift right (in the direction Q_A toward Q_D)
• Shift left (in the direction Q_D toward Q_A)
• Parallel (broadside) load
SN54AS194 . . . FK PACKAGE
(TOP VIEW)
A
3 2 1 20 19
4
18
Q_B
B₅
17 ^Q_C
NC 6
16 NC
C7
15 Q_D
D8
14 CLK
9 10 11 12 13
Parallel synchronous loading is accomplished by
applying the four bits of data and taking both S0
and S1 high. The data is loaded into the
associated flip-flops and appears at the outputs
after the positive transition of the clock (CLK)
input. During loading, serial data flow is inhibited.
NC − No internal connection
Shift right is accomplished synchronously with the rising edge of the clock pulse when S0 is high and S1 is low.
Serial data for this mode is entered at the shift-right data input. When S0 is low and S1 is high, data shifts left
synchronously and new data is entered at the shift-left serial inputs. Clocking of the flip-flop is inhibited when
both mode-control inputs are low.
The SN54AS194 is characterized for operation over the full military temperature range of −55°C to 125°C. The
SN74AS194 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.
Copyright  1994, Texas Instruments Incorporated
• POST OFFICE BOX 655303 DALLAS, TEXAS 75265
1
• POST OFFICE BOX 1443 HOUSTON, TEXAS 77251−1443