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參數(shù)資料
| 型號： | MC74F574 |
| 廠商： | Motorola, Inc. |
| 英文描述： | OCTAL D-TYPE FLIP-FLOP WITH 3-STATE OUTPUTS |
| 中文描述： | 八路D型倒裝3次浮點(diǎn)運(yùn)算態(tài)輸出 |
| 文件頁數(shù)： | 2/3頁 |
| 文件大小： | 94K |
| 代理商： | MC74F574 |
4-227
FAST AND LS TTL DATA
MC74F574
FUNCTION TABLE
Inputs
Register
Outputs
Operating Mode
OE
CP
Dn
l
h
Internal
Q0–Q7
L
H
L
L
↑
↑
L
H
Load and read register
L
↑
X
NC
NC
Hold
H
H
↑
X
Dn
X
Dn
X
Z
Z
Disable outputs
H = HIGH voltage level
h = HIGH voltage level one set-up time prior to the Low-to-High clock transition
L = LOW voltage level
l = LOW voltage level one set-up time prior to the Low-to-High clock transition
NC = No change
X = Don’t care
Z = High impedance “off” state
↑
= Low-to-High clock transition
= Not a Low-to-High clock transition
↑
FUNCTIONAL DESCRIPTION
The MC74F574 consists of eight edge-triggered flip-flops
with individual D-type inputs and 3-state true outputs. The
buffered clock and buffered Output Enable are common to all
flip-flops. The eight flip-flops will store the state of their individ-
ual D inputs that meet the setup and hold times requirements
on the LOW-to-HIGH Clock (CP) transition. With the Output
Enable (OE) LOW, the contents of the eight flip-flops are avail-
able at the outputs. When the OE is HIGH, the outputs go to
the high impedance state. Operation of the OE input does not
affect the state of the flip-flops.
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE
(unless otherwise specified)
Symbol
Parameter
Limits
Unit
(Note 1)
Min
Typ
Max
Test Conditions
VIH
VIL
VIK
Input HIGH Voltage
2.0
—
—
V
Guaranteed Input HIGH Voltage
Input LOW Voltage
—
—
0.8
V
Guaranteed Input LOW Voltage
Input Clamp Diode Voltage
—
—
–1.2
V
VCC = MIN, IIN = –18 mA
VOH
Output HIGH Voltage
2.4
—
—
V
IOH = –3.0 mA
VCC = MIN
VCC = 4.75 V
VCC = MIN
2.7
—
—
V
VOL
Output LOW Voltage
—
—
0.5
V
IOL = 24 mA
VCC = MAX, VIN = 2.7 V
VCC = MAX, VIN = 7.0 V
VCC = MAX, VIN = 0.5 V
VCC = MAX, VOUT = 2.7 V
VCC = MAX, VOUT = 0.5 V
VCC = MAX, VOUT = 0 V
IIH
Input HIGH Current
—
—
20
μ
A
—
—
100
IIL
IOZH
IOZL
IOS
Input LOW Current
—
—
–0.6
mA
Output Off Current — HIGH
—
—
50
μ
A
Output Off Current — LOW
—
—
–50
μ
A
Output Short Circuit Current (Note 2)
–60
—
–150
mA
ICCZ
Power Supply Current
(All Outputs OFF)
—
55
86
mA
VCC = MAX
Dn – GND;
OE = 4.5 V
NOTES:
1. For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions for the applicable device type.
2. Not more than one output should be shorted at a time, nor for more than 1 second.
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