HD74HCT688 Datasheet, PDF (4/8 Pages) Hitachi Semiconductor – 8-bit Magnitude Comparator

HD74HCT688
Recommended Operating Conditions
Item
Symbol
Ratings
Supply voltage
V_CC
4.5 to 5.5
Input / Output voltage
V_IN, V_OUT
0 to V_CC
Operating temperature
Input rise / fall time^*1
Ta
–40 to 85
t_r, t_f
0 to 500
Notes: 1. This item guarantees maximum limit when one input switches.
Waveform: Refer to test circuit of switching characteristics.
Unit
V
V
°C
ns
Conditions
V_CC = 4.5 V
Electrical Characteristics
Item
Input voltage
Output voltage
Input current
Quiescent current
Symbol V_CC (V)
V_IH 4.5 to 5.5
V_IL 4.5 to 5.5
V_OH
4.5
4.5
V_OL
4.5
4.5
Iin
5.5
I_CC
5.5
Ta = 25°C
Min Typ Max
2.0 — —
— — 0.8
4.4 — —
4.18 — —
— — 0.1
— — 0.26
— — ±0.1
— — 4.0
Ta = –40 to+85°C
Min
Max
2.0
—
—
0.8
4.4
—
4.13
—
—
0.1
—
0.33
—
±1.0
—
40
Unit
V
V
V
V
µA
µA
Test Conditions
Vin = V_IH or V_IL I_OH = –20 µA
I_OH = –4 mA
Vin = V_IH or V_IL I_OL = 20 µA
I_OL = 4 mA
Vin = V_CC or GND
Vin = V_CC or GND, Iout = 0 µA
Switching Characteristics
Item
Propagation delay
time
Output rise/fall time
Input capacitance
Symbol
t_PLH
t_PHL
t_PLH
t_PHL
t_TLH
t_THL
Cin
V_CC (V)
4.5
4.5
4.5
4.5
4.5
—
Ta = 25°C
Min Typ Max
— 17 42
— 19 42
—
9
24
— 12 24
—
5
15
Ta = –40 to +85°C
Min Max
—
53
—
53
—
30
—
30
—
19
(C_L = 50 pF, Input t_r = t_f = 6 ns)
Unit
Test Conditions
ns Por Q to output
ns Enable to output
ns
—
5
10
—
10
pF
Test Circuit
VCC
VCC
Input
Pulse Generator
Zout = 50 Ω
G
P₁
Output
P₇
P=Q
Q₀
Q₇
C_L =
50 pF
Note : 1. C_L includes probe and jig capacitance.
Rev.2.00, Mar 30, 2006 page 4 of 7