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参数资料
| 型号： | SN54HC21W |
| 厂商： | Texas Instruments, Inc. |
| 英文描述： | Up to 18V NiCd/NiMH Battery Fast Charge Controller with 177s Hold-off Time; Package: 8 LEAD PDIP; No of Pins: 8; Container: Rail; Qty per Container: 50 |
| 中文描述： | 双4输入阳性与门 |
| 文件页数： | 4/5页 |
| 文件大小： | 77K |
| 代理商： | SN54HC21W |
SN54HC21, SN74HC21
DUAL 4-INPUT POSITIVE-AND GATES
SCLS087C – DECEMBER 1982 – REVISED MAY 1997
4
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
PARAMETER MEASUREMENT INFORMATION
VOLTAGE WAVEFORM
INPUT RISE AND FALL TIMES
50%
10%
50%
10%
90%
90%
VCC
0 V
tr
tf
Input
VOLTAGE WAVEFORMS
PROPAGATION DELAY AND OUTPUT TRANSITION TIMES
50%
50%
10%
50%
10%
90%
90%
VCC
VOH
VOL
0 V
tr
tf
Input
In-Phase
Output
50%
tPLH
tPHL
50%
10%
50%
10%
90%
90%
VOH
VOL
tr
tf
tPHL
tPLH
Out-of-Phase
Output
Test
Point
From Output
Under Test
CL = 50 pF
(see Note A)
LOAD CIRCUIT
NOTES: A. CL includes probe and test-fixture capacitance.
B. Phase relationships between waveforms were chosen arbitrarily. All input pulses are supplied by generators having the following
characteristics: PRR
≤
1 MHz, ZO = 50
, tr = 6 ns, tf = 6 ns.
C. The outputs are measured one at a time with one input transition per measurement.
D. tPLH and tPHL are the same as tpd.
Figure 1. Load Circuit and Voltage Waveforms
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