HD74HC148 Datasheet, PDF (3/6 Pages) Hitachi Semiconductor – 8-to-3-line Octal Priority Encoder

HD74HC148
Electrical Characteristics
Item
Input voltage
Output voltage
Input current
Quiescent supply
current
Symbol
VIH
VIL
VOH
VOL
Iin
ICC
VCC (V)
2.0
4.5
6.0
2.0
4.5
6.0
2.0
4.5
6.0
4.5
6.0
2.0
4.5
6.0
4.5
6.0
6.0
6.0
Ta = 25°C
Min Typ Max
1.5 — —
3.15 — —
4.2 — —
— — 0.5
— — 1.35
— — 1.8
1.9 2.0 —
4.4 4.5 —
5.9 6.0 —
4.18 — —
5.68 — —
— 0.0 0.1
— 0.0 0.1
— 0.0 0.1
— — 0.26
— — 0.26
— — ±0.1
— — 4.0
Ta = –40 to+85°C
Min Max Unit
Test Conditions
1.5
—
V
3.15
—
4.2
—
—
0.5 V
—
1.35
—
1.8
1.9
—
V Vin = VIH or VIL IOH = –20 µA
4.4
—
5.9
—
4.13
5.63
—
—
—
IOH = –4 mA
—
IOH = –5.2 mA
0.1
V Vin = VIH or VIL IOL = 20 µA
0.1
—
0.1
—
0.33
IOL = 4 mA
—
0.33
IOL = 5.2 mA
—
±1.0 µA Vin = VCC or GND
—
40 µA Vin = VCC or GND, Iout = 0 µA
Switching Characteristics (C_L = 50 pF, Input t_r = t_f = 6 ns)
Item
Propagation delay
time
Output rise/fall
time
Input capacitance
Symbol VCC (V)
tPLH, tPHL 2.0
4.5
6.0
tPLH, tPHL 2.0
4.5
6.0
tPLH, tPHL 2.0
4.5
6.0
tPLH, tPHL 2.0
4.5
6.0
tPLH, tPHL 2.0
4.5
6.0
tPLH, tPHL 2.0
4.5
6.0
tTLH, tTHL 2.0
4.5
6.0
Cin
—
Ta = 25°C
Ta = –40 to +85°C
Min Typ Max Min Max Unit
Test Conditions
— — 230 —
— 15 46
—
290 ns 0 - 7 to A0 - A2
58
— — 39
—
49
— — 250 —
315 ns 0 - 7 to EO
— 16 50
—
63
— — 43
—
54
— — 270 —
340 ns 0 - 7 to GS
— 18 54
—
68
— — 46
—
58
— — 230 —
— 12 46
—
290 ns EI to A0 - A2
58
— — 39
—
49
— — 250 —
315 ns EI to GS
— 12 50
—
63
— — 43
—
54
— — 270 —
340 ns EI to EO
— 12 54
—
68
— — 46
—
58
— — 75
—
90 ns
— 5 15
—
19
— — 13
—
16
— 5 10
—
10 pF
Rev.2.00, Oct 11, 2005 page 3 of 5