74ABT845D Просмотр технического описания (PDF) - Philips Electronics
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74ABT845D Datasheet PDF : 7 Pages
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Philips Semiconductors
8-bit bus interface latch with set and reset
(3-State)
Product specification
74ABT845
AC CHARACTERISTICS
GND = 0V, tR = tF = 2.5ns, CL = 50pF, RL = 500Ω
SYMBOL
PARAMETER
WAVEFORM
tPLH
Propagation delay
tPHL
Dn to Qn
1
tPLH
Propagation delay
tPHL
LE to Qn
2
tPLH
Propagation delay
tPHL
PRE to Qn
1
tPLH
Propagation delay
tPHL
MR to Qn
1
tPZH
Output enable time
4
tPZL
OEn to Qn
5
tPHZ
Output disable time
4
tPLZ
OEn to Qn
5
LIMITS
Tamb = +25oC
VCC = +5.0V
Min
Typ
Max
1.0
3.9
5.4
2.2
5.4
6.8
2.0
5.1
6.6
2.8
6.4
7.9
2.2
4.9
6.6
3.0
5.3
6.8
2.4
4.9
6.4
3.1
5.9
7.3
1.0
3.8
5.4
2.0
4.7
6.1
1.9
4.6
6.2
2.2
4.7
6.4
Tamb = -40 to
+85oC
VCC = +5.0V ±0.5V
Min
Max
1.0
6.2
2.2
7.8
2.0
7.5
2.8
8.9
2.2
7.8
3.0
7.4
2.4
7.3
3.1
8.5
1.0
6.3
2.0
6.7
1.9
7.2
2.2
7.0
UNIT
ns
ns
ns
ns
ns
ns
AC SETUP REQUIREMENTS
GND = 0V, tR = tF = 2.5ns, CL = 50pF, RL = 500Ω
SYMBOL
PARAMETER
ts(H)
ts(L)
th(H)
th(L)
tw(H)
tw(L)
tw(L)
trec
trec
Setup time, High or Low
Dn to LE
Hold time, High or Low
Dn to LE
LE pulse width, High
PRE pulse width, Low
MR pulse width, Low
PRE recovery time
MR recovery time
WAVEFORM
3
3
3
6
6
6
6
LIMITS
Tamb = +25oC
VCC = +5.0V
Min
Typ
Tamb = -40 to +85oC
VCC = +5.0V ±0.5V
Min
2.8
1.0
2.8
3.5
1.4
3.5
1.0
–1.2
1.0
1.0
–0.6
1.0
3.0
1.5
3.0
3.5
2.0
3.5
2.8
1.3
2.8
3.0
1.4
3.0
3.4
1.6
3.4
UNIT
ns
ns
ns
ns
ns
ns
ns
1995 Sep 06
5
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