參數(shù)資料
型號： SN54F21J
廠商： Texas Instruments, Inc.
英文描述： 8Kx8 Nonvolatile SRAM, 10% Voltage Tolerance 28-DIP MODULE -40 to 85
中文描述： 雙4輸入陽性與門
文件頁數(shù)： 4/5頁
文件大?。?/td> 67K
代理商： SN54F21J
SN54HC20, SN74HC20
DUAL 4-INPUT POSITIVE-NAND GATES
SCLS086D – DECEMBER 1982 – REVISED FEBRUARY 2000
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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