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SN74ALS232B Scheda tecnica(PDF) 7 Page - Texas Instruments

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Il numero della parte SN74ALS232B
Spiegazioni elettronici  16 횞 4 ASYNCHRONOUS FIRST-IN, FIRST-OUT MEMORY
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Produttore elettronici  TI [Texas Instruments]
Homepage  http://www.ti.com
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SN74ALS232B Scheda tecnica(HTML) 7 Page - Texas Instruments

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SN74ALS232B
16
× 4 ASYNCHRONOUS FIRST-IN, FIRST-OUT MEMORY
SCAS251B – FEBRUARY 1989 – REVISED APRIL 1998
7
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
PARAMETER MEASUREMENT INFORMATION
tPHZ
tPLZ
tPHL
tPLH
0.3 V
tPZL
tPZH
tPLH
tPHL
LOAD CIRCUIT FOR 3-STATE OUTPUTS
From Output
Under Test
Test Point
R1 = 500
S1
CL = 50 pF
7 V
(see Note A)
Open
1.3 V
1.3 V
1.3 V
3.5 V
3.5 V
0.3 V
0.3 V
th
tsu
VOLTAGE WAVEFORMS
SETUP AND HOLD TIMES
Timing
Input
Data
Input
1.3 V
1.3 V
3.5 V
3.5 V
0.3 V
0.3 V
High-Level
Pulse
Low-Level
Pulse
VOLTAGE WAVEFORMS
PULSE DURATION
Input
(see Note C)
Out-of-Phase
Output
1.3 V
1.3 V
1.3 V
1.3 V
1.3 V
1.3 V
1.3 V
1.3 V
1.3 V
1.3 V
3.5 V
3.5 V
0.3 V
0.3 V
VOL
VOH
VOH
VOL
Output
Control
Waveform 1
S1 Closed
(see Note B)
Waveform 2
S1 Open
(see Note B)
0 V
VOH
VOL
3.5 V
In-Phase
Output
0.3 V
1.3 V
1.3 V
VOLTAGE WAVEFORMS
PROPAGATION DELAY TIMES
VOLTAGE WAVEFORMS
ENABLE AND DISABLE TIMES, 3-STATE OUTPUTS
SWITCH POSITION TABLE
R2 = 500
tw
NOTES: A. CL includes probe and jig capacitance.
B. Waveform 1 is for an output with internal conditions such that the output is low except when disabled by the output control.
Waveform 2 is for an output with internal conditions such that the output is high except when disabled by the output control.
C. All input pulses are supplied by generators having the following characteristics: PRR
≤ 1 MHz, Zo = 50 Ω, tr ≤ 2 ns, tf ≤ 2 ns.
D. The outputs are measured one at a time with one transition per measurement.
tPZH
tPZL
tPHZ
tPLZ
tPLH
tPHL
Open
Closed
Open
Closed
Open
Open
PARAMETER
S1
ten
tdis
tpd
Figure 1. Load Circuit and Voltage Waveforms


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