MC74F544DW 查看數據表（PDF） - Motorola => Freescale
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MC74F544DW Datasheet PDF : 4 Pages
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MC74F544
FUNCTION TABLE
Inputs
OEXX
EXX
LEXX
Data
Outputs
Status
H
X
X
X
Z
Outputs disabled
X
H
X
X
Z
Outputs disabled
L
↑
L
l
L
↑
L
h
Z
Outputs disabled
Z
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
Min Typ Max Unit
Test Conditions
(Note 1)
VIH
VIL
VIK
VOH
VOL
IIH
Input HIGH Voltage
2.0 —
—
V
Input LOW Voltage
— — 0.8
V
Input Clamp Diode Voltage
— – 0.73 – 1.2
V
2.4 —
—
A0 – A7
74
V
Output HIGH Voltage
2.7 3.4 —
B0 – B7
74
2.0 —
—
V
A0 – A7
74
Output LOW Voltage
B0 – B7
74
— 0.35 0.5
V
— 0.4 0.55
V
I/O Pins
— — 1.0
mA
Input HIGH Current
Control Pins — — 100
µA
Control Pins — — 20
µA
I/O Pins
— — 70
µA
Guaranteed Input HIGH Voltage
Guaranteed Input LOW Voltage
VCC = MIN, IIN = – 18 mA
IOH = – 3.0 mA
VCC = 4.5 V
VCC = 4.75 V
IOH = – 15 mA
VCC = 4.5 V
IOL = 24 mA
IOL = 64 mA
VCC = MIN
VCC = MAX, VIN = 5.5 V
VCC = MAX, VIN = 7.0 V
VCC = MAX, VIN = 2.7 V
IIL
Input LOW Current
EAB, EBA —
Other Inputs —
— – 1.2
mA
— – 0.6
VCC = MAX, VIN = 0.5 V
IOZH
IOZL
Off-State Output Current
Off-State Output Current,
Low-Level Voltage Applied
— — 70
µA
— — – 600 µA
VCC = MAX, VOUT = 2.7 V
VCC = MAX, VOUT = 0.5 V
IOS
Output Short Circuit Current (Note 2) An Outputs – 60 — –150
mA
Bn Outputs – 100 — –225
VCC = MAX, VOUT = 0 V
ICCH
— 70 105
ICC
Total Supply Current
ICCL
—
95 130
mA
VCC = MAX
ICCZ
— 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.
FAST AND LS TTL DATA
4-217
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