HD74HC221 Datasheet, PDF (4/8 Pages) Hitachi Semiconductor – Dual Monostable Multivibrators (with Schmitt Trigger Input)

HD74HC221
Switching Characteristics
(C_L = 50 pF, Input t_r = t_f = 6 ns)
Item
Ta = 25°C
Ta = –40 to +85°C
Symbol V_CC (V) _{Min Typ Max Min}
Unit
Max
Test Conditions
Trigger
t_PLH
propagation delay
time
2.0 — — 210 —
4.5 — — 42
—
6.0 — — 36
—
265 ns A, B or Clear to Q
53
45
t_PHL
2.0 — — 240 —
300 ns A, B or Clear to Q
4.5 — — 48
—
60
6.0 — — 41
—
51
Propagation delay tPHL
time
2.0 — — 170 —
4.5 — — 34
—
215 ns Clear to Q
43
6.0 — — 29
—
37
t_PLH
2.0 — — 180 —
225 ns Clear to Q
4.5 — — 36
—
45
6.0 — — 31
—
38
Pulse width
t_w
2.0 80 — — 100
—
ns A, B, Clear
4.5 16 — —
20
—
6.0 14 — —
17
—
Minimum output
t_{WQ (min)}
2.0
— 1.5 —
—
pulse width
4.5 — 450 —
—
—
µs Cext = 28 pF Rext = 6 kΩ
—
ns
Rext = 2 kΩ
6.0 — 380 —
—
—
Output pulse width t_WQ
4.5 0.63 0.7 0.77 —
— ms Cext = 0.1 µF
Rext = 10 kΩ
Output rise/fall
time
t_TLH
2.0 — — 75
—
t_THL
4.5 — — 15
—
95
ns
19
6.0 — — 13
—
16
Input capacitance Cin
—
—
5
10
—
10 pF
Caution in use: In order to prevent any malfunctions due to noise, connect a high-frequency performance capacitor
between V_CC and GND, and keep the wiring between the external components and Cext, Rext/Cext
pins as short as possible.
Test Circuit
VCC
Input A
Pulse Generator
Zout = 50 Ω
Input B
Pulse Generator
Zout = 50 Ω
Input Clear
Pulse Generator
Zout = 50 Ω
VCC
Cext Rext
Cext Rext/Cext
Q
Output
C_L =
50 pF
Output
Q
Clear
C_L =
50 pF
Note : 1. C_L includes probe and jig capacitance.
Rev.2.00 Jan 31, 2006 page 4 of 7