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參數(shù)資料
| 型號(hào)： | MC74F544N |
| 廠商： | MOTOROLA INC |
| 元件分類： | 通用總線功能 |
| 英文描述： | 220nA Supervisor with 10ms/200ms selectable delay time 5-SOT-23 -40 to 85 |
| 中文描述： | F/FAST SERIES, 8-BIT REGISTERED TRANSCEIVER, INVERTED OUTPUT, PDIP24 |
| 封裝： | 724-03 |
| 文件頁數(shù)： | 2/4頁 |
| 文件大?。?/td> | 82K |
| 代理商： | MC74F544N |
4-217
FAST AND LS TTL DATA
MC74F544
FUNCTION TABLE
Inputs
Outputs
Status
OEXX
EXX
LEXX
Data
H
X
X
X
Z
Outputs disabled
X
H
X
X
Z
Outputs disabled
L
L
↑
↑
L
L
l
h
Z
Z
Outputs disabled
Data latched
L
L
L
L
↑
↑
l
h
H
L
Data latched
L
L
L
L
L
L
L
H
H
L
Transparent
L
L
H
X
NC
Hold
H = HIGH voltage level: h = HIGH state must be present one set-up time before the LOW-to-HIGH transition of LEXX or EXX (XX = AB or BA): L = LOW voltage level:
l = LOW state must be present one set-up time before the LOW-to-HIGH transition of LEXX or EXX (XX = AB or BA): X = Don’t care: Z = HIGH impedance state:
NC = No Change.
FUNCTIONAL DESCRIPTION
The MC74F544 contains two sets of eight D-type latches,
with separate input and controls for each set. For data flow
from A to B, for example, the A-to-B Enable (EAB) input must
be LOW in order to enter data from A0–A7 or take data from
B0–B7, as indicated in the Function Table. With EAB LOW,
a LOW signal on the A-to-B latch enable (LEAB) input makes
the A-to-B latches transparent; a subsequent LOW-to-HIGH
transition of the LEAB signal puts the A latches in the storage
mode and their outputs no longer change with the A inputs.
With EAB and OEAB both LOW, the 3-State B output buffers
are active and reflect the inverted data present at the output
of the A latches. Control of data flow from B to A is similar, but
using the EBA, LEBA, and OEBA inputs.
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
—
–0.73
–1.2
V
VCC = MIN, IIN = –18 mA
VOH
Output HIGH Voltage
A0–A7
74
2.4
—
—
V
IOH = –3.0 mA
VCC = 4.5 V
VCC = 4.75 V
VCC = 4.5 V
2.7
3.4
—
B0–B7
74
2.0
—
—
V
IOH = –15 mA
IOL = 24 mA
IOL = 64 mA
VCC = MAX, VIN = 5.5 V
VCC = MAX, VIN = 7.0 V
VOL
Output LOW Voltage
A0–A7
74
—
0.35
0.5
V
VCC = MIN
B0–B7
74
—
0.4
0.55
V
IIH
Input HIGH Current
I/O Pins
—
—
1.0
mA
μ
A
μ
A
μ
A
Control Pins
—
—
100
Control Pins
—
—
20
VCC = MAX, VIN = 2.7 V
I/O Pins
—
—
70
IIL
Input LOW Current
EAB, EBA
—
—
–1.2
mA
VCC = MAX, VIN = 0.5 V
Other Inputs
—
—
–0.6
IOZH
Off-State Output Current
—
—
70
μ
A
VCC = MAX, VOUT = 2.7 V
IOZL
Off-State Output Current,
Low-Level Voltage Applied
—
—
–600
μ
A
VCC = MAX, VOUT = 0.5 V
IOS
Output Short Circuit Current (Note 2)
AnOutputs
BnOutputs
ICCH
ICCL
ICCZ
–60
—
–150
mA
VCC = MAX, VOUT = 0 V
–100
—
–225
ICC
Total Supply Current
—
70
105
mA
VCC = MAX
—
95
130
—
95
125
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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