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74HC7541 Datasheet, PDF (6/7 Pages) NXP Semiconductors – Octal Schmitt trigger buffer/line driver; 3-state | |||
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Philips Semiconductors
Octal Schmitt trigger buffer/line driver; 3-state
Product speciï¬cation
74HC/HCT7541
DC CHARACTERISTICS FOR 74HCT
For the DC characteristics see â74HC/HCT/HCU/HCMOS Logic Family Specificationsâ.
Transfer characteristics are given below (not applicable for OEn inputs).
Output capability: bus driver
ICC category: MSI
Note to HCT types
The value of additional quiescent supply current (âICC) for a unit load of 1 is given in the family specifications.
To determine âICC per input, multiply this value by the unit load coefficient shown in the table below.
INPUT
UNIT LOAD COEFFICIENT
OE1
1.30
OE2
1.30
An
0.20
AC CHARACTERISTICS FOR 74HCT
GND = 0 V; tr = tf = 6 ns; CL = 50 pF
Tamb (°C)
TEST CONDITIONS
SYMBOL PARAMETER
74HCT
+25
â40 to +85
â40 to +125
UNIT
VCC
(V)
WAVEFORMS
min typ. max min. max min. max.
tPHL/ tPLH propagation delay
An to Yn
19 32
40
tPZH/ tPZL 3-state output enable time
18 32
40
OEn to Yn
tPHZ/ tPLZ 3-state output disable time
20 32
40
OEn to Yn
tTHL/ tTLH output transition time
5 12
15
48 ns 4.5 Fig.8
48 ns 4.5 Fig.8
48 ns 4.5 Fig.8
18 ns 4.5 Fig.8
TRANSFER CHARACTERISTICS FOR 74HCT
Voltages are referred to GND (ground = 0 V)
Tamb (°C)
TEST CONDITIONS
SYMBOL PARAMETER
74HCT
+25
â40 to +85
â40 to +125
UNIT
VCC
(V)
WAVEFORMS
min. typ. max. min. max. min. max.
VT+
positive-going threshold
2.0
2.0
2.1
2.1
2.0 V
2.1
4.5 Figs 6 and 7
5.5
VTâ
negative-going threshold 0.70
0.80
0.64
0.60
V 4.5 Figs 6 and 7
0.74
0.70
5.5
VH
hysteresis (VT+ â VTâ) 0.17 0.23
0.17 0.23
V 4.5 Figs 6 and 7
5.5
December 1990
6
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