Datasheet

CD74HCT4543
BCD-TO-7 SEGMENT LATCH/DECODER/DRIVER
SCHS281A – REVISED MAY 2003
5
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
HCT INPUT LOADING TABLE
INPUT UNIT LOADS
†
D0, D1, D2 1
D3, BI 0.5
PH 1.25
LD 1.5
†
Unit Load is ∆I
CC
limit specified in electrical
characteristics table, e.g., 360 µA maximum
at 25°C.
timing requirements over recommended operating free-air temperature range V
CC
= 4.5 V (unless
otherwise noted) (see Figure 1)
T
A
= 25°C
T
A
= –55°C
TO 125°C
T
A
= –40°C
TO 85°C
UNIT
MIN MAX MIN MAX MIN MAX
t
w
Pulse duration, LD high 10 15 13 ns
t
su
Setup time, BCD inputs before LD↓ 12 18 15 ns
t
h
Hold time, BCD inputs before LD↓ 8 12 10 ns
switching characteristics over recommended operating free-air temperature range (unless
otherwise noted) (see Figure 2)
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
LOAD
CAPACITANCE
V
CC
T
A
= 25°C
T
A
= –55°C
TO 125°C
T
A
= –40°C
TO 85°C
UNIT
(INPUT)
(OUTPUT)
CAPACITANCE
CC
MIN TYP MAX MIN MAX MIN MAX
D
Out
p
ut
C
L
= 50 pF 4.5 V 80 120 100
D
n
Output
C
L
= 15 pF 5 V 33
LD
Out
p
ut
C
L
= 50 pF 4.5 V 77 116 96
t
d
LD
Output
C
L
= 15 pF 5 V 32
ns
t
pd
BI
Out
p
ut
C
L
= 50 pF 4.5 V 66 99 83
ns
BI
Output
C
L
= 15 pF 5 V 27
PH
Out
p
ut
C
L
= 50 pF 4.5 V 66 99 83
PH
Output
C
L
= 15 pF 5 V 27
t
t
Any C
L
= 50 pF 4.5 V 50 75 63 ns
operating characteristics, V
CC
= 5 V, T
A
= 25°C
PARAMETER TYP
UNIT
C
pd
‡
Power dissipation capacitance 54 pF
‡
C
pd
is used to determine the dynamic power consumption, per package.
P
D
= C
pd
V
CC
2
f
i
+ ∑ C
L
V
CC
2
f
o
where: f
i
= input frequency
f
o
= output frequency
C
L
= output load capacitance
V
CC
= supply voltage