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參數資料
| 型號： | 83021012A |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 計數移位寄存器 |
| 英文描述： | ALS SERIES, 8-BIT BIDIRECTIONAL PARALLEL IN PARALLEL OUT SHIFT REGISTER, TRUE OUTPUT, CQCC20 |
| 封裝： | CERAMIC, LCC-20 |
| 文件頁數： | 1/17頁 |
| 文件大小： | 693K |
| 代理商： | 83021012A |
SN54ALS299, SN74ALS299
8-BIT UNIVERSAL SHIFT/STORAGE REGISTERS
WITH 3-STATE OUTPUTS
SDAS220B – DECEMBER 1982 – REVISED DECEMBER 1994
Copyright
1994, Texas Instruments Incorporated
1
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
Multiplexed I/O Ports Provide Improved Bit
Density
Four Modes of Operation:
– Hold (Store)
– Shift Right
– Shift Left
– Load Data
Operate 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 (DW) Packages, Ceramic
Chip Carriers (FK), and Standard Plastic (N)
and Ceramic (J) 300-mil DIPs
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.
Synchronous parallel loading is accomplished by taking both S0 and S1 high. This places the 3-state outputs
in the high-impedance state and permits data 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
asynchronously when the clear (CLR) input is low. Taking either OE1 or OE2 high disables the outputs, but has
no effect on clearing, shifting, or storing data.
The SN54ALS299 is characterized for operation over the full military temperature range of – 55
°C to 125°C. The
SN74ALS299 is characterized for operation from 0
°C to 70°C.
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
S0
OE1
OE2
G/QG
E/QE
C/QC
A/QA
QA′
CLR
GND
VCC
S1
SL
QH′
H/QH
F/QF
D/QD
B/QB
CLK
SR
SN54ALS299 ...J PACKAGE
SN74ALS299 . . . DW OR N PACKAGE
(TOP VIEW)
3
2120 19
910 11 12 13
4
5
6
7
8
18
17
16
15
14
SL
QH′
H/QH
F/QF
D/QD
G/QG
E/QE
C/QC
A/QA
QA′
OE2
OE1
S0
CLK
B/Q
S1
CLR
GND
SR
V
CC
SN54ALS299 . . . FK PACKAGE
(TOP VIEW)
B
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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