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参数资料
| 型号： | M74HC299TTR |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 计数移位寄存器 |
| 英文描述： | HC/UH SERIES, 8-BIT BIDIRECTIONAL PARALLEL IN PARALLEL OUT SHIFT REGISTER, TRUE OUTPUT, PDSO20 |
| 封装： | TSSOP-20 |
| 文件页数： | 6/13页 |
| 文件大小： | 414K |
| 代理商： | M74HC299TTR |
M74HC299
2/13
IINPUT AND OUTPUT EQUIVALENT CIRCUIT
PIN DESCRIPTION
TRUTH TABLE
* When one or both output controls are high, the eight input/output terminals are in the high impedance state: however sequential operation
or clearing of the register is not affected.
Z : High Impedance
Qn0 : The level of An before the indicated steady state input conditions were established.
Qnn : The level of Qn before the most recent active transition indicated by
OR
a, h : The level of the steady state inputs A, H, respectively.
X : Don’t Care
PIN No
SYMBOL
NAME AND FUNCTION
1, 19
S0, S1
Mode Select Inputs
2, 3
G1, G2
3-State Output Enable Inputs (Active LOW)
7, 13, 6, 14, 5, 15, 4, 16
A/QA to H/QH
Parallel Data Inputs or 3-State Parallel Outputs (Bus Driver)
8, 17
QA’ to QH’
Serial Outputs (Standard Output)
9
CLEAR
Asynchronous Master Reset Input (Active LOW)
11
SR
Serial Data Shift Right Input
12
CLOCK
Clock Input (LOW to HIGH, Edge-triggered)
18
SL
Serial Data Shift Left Input
10
GND
Ground (0V)
20
VCC
Positive Supply Voltage
MODE
INPUTS
INPUTS/OUTPUTS
OUTPUTS
CLEAR
FUNCTION
SELECTED
OUTPUT
CONTROL
CLOCK
SERIAL
A/QA
H/QH
QA’
QH’
S1
S0
G1*G2*SL
SR
Z
L
H
X
XXX
X
Z
L
CLEAR
L
X
L
X
LLLL
L
X
L
X
LLLL
HOLD
H
L
X
QA0
QH0
QA0
QH0
SHIFT
RIGHT
H
L
H
L
X
H
QGn
H
QGn
H
L
H
L
X
L
QGn
L
QGn
SHIFT
LEFT
H
L
H
X
QBnH
H
L
X
QBnL
LOAD
H
X
ahah
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