HIT HD74HC280 Datasheet
HD74HC280
9-bit Odd/Even Parity Generator/Checker
Description
This parity generator/checker features odd/even outputs to facilitate operation of either odd or even parity
applications. The word length capability is easily expanded by cascading devices.
Features
• High Speed Operation: tpd (Data to Even or Odd) = 22 ns typ (CL = 50 pF)
• High Output Current: Fanout of 10 LSTTL Loads
• Wide Operating Voltage: VCC = 2 to 6 V
• Low Input Current: 1 µA max
• Low Quiescent Supply Current: ICC (static) = 4 µA max (Ta = 25°C)
Function Table
Outputs
Number of inputs A through I that are high ∑ Even ∑ Odd
0, 2, 4, 6, 8 H L
1, 3, 5, 7, 9 L H
HD74HC280
Pin Arrangement
Inputs
Input
Outputs
NC
∑
Even
∑
Odd
GND
G
1
H
2
3
I
4
5
6
7
G
H
I
∑ Even
∑ Odd
A
(Top view)
F
E
D
C
B
14
13
12
11
10
V
CC
F
E
D
Inputs
C
9
B
8
A
2
HD74HC280
DC Characteristics
Ta = –40 to
Ta = 25°C
Item Symbol V
Input voltage V
IH
(V) Min Typ Max Min Max Unit Test Conditions
CC
2.0 1.5 — — 1.5 — V
4.5 3.15 — — 3.15 —
6.0 4.2 — — 4.2 —
V
IL
2.0 — — 0.5 — 0.5 V
4.5 — — 1.35 — 1.35
6.0 — — 1.8 — 1.8
Output voltage V
OH
2.0 1.9 2.0 — 1.9 — V Vin = VIH or VILIOH = –20 µA
4.5 4.4 4.5 — 4.4 —
6.0 5.9 6.0 — 5.9 —
4.5 4.18 — — 4.13 — IOH = –4 mA
6.0 5.68 — — 5.63 — IOH = –5.2 mA
V
OL
2.0 — 0.0 0.1 — 0.1 V Vin = VIH or VILIOL = 20 µA
4.5 — 0.0 0.1 — 0.1
6.0 — 0.0 0.1 — 0.1
4.5 — — 0.26 — 0.33 IOL = 4 mA
6.0 — — 0.26 — 0.33 IOL = 5.2 mA
Input current Iin 6.0 — — ±0.1 — ±1.0 µA Vin = VCC or GND
Quiescent supply
I
CC
6.0 — — 4.0 — 40 µA Vin = VCC or GND, Iout = 0 µA
current
+85°C
AC Characteristics (CL = 50 pF, Input tr = tf = 6 ns)
Ta = –40 to
Ta = 25°C
Item Symbol V
Propagation delay t
time t
PLH
PHL
(V) Min Typ Max Min Max Unit Test Conditions
CC
2.0 — — 205 — 255 ns Data to ∑ Even or ∑ Odd
4.5 — 22 41 — 51
6.0 — — 35 — 43
Output rise/fall t
time t
TLH
THL
2.0 — — 75 — 95 ns
4.5 — 5 15 — 19
6.0 — — 13 — 16
Input capacitance Cin — — 5 10 — 10 pF
+85°C
3
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