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SN74F657 Datenblatt(PDF) 6 Page - Texas Instruments

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Teilenummer SN74F657
Bauteilbeschribung  OCTAL TRANSCEIVER WITH PARITY GENERATOR/CHECKER AND 3-STATE OUTPUTS
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Hersteller  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
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SN74F657
OCTAL TRANSCEIVER WITH PARITY GENERATOR/CHECKER
AND 3-STATE OUTPUTS
SDFS027A – D3217, JANUARY 1989 – REVISED OCTOBER 1993
2–6
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
switching characteristics (see Note 2)
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
VCC = 5 V,
CL = 50 pF,
R1 = 500
Ω,
R2 = 500
Ω,
TA = 25°C
VCC = 4.5 V to 5.5 V,
CL = 50 pF,
R1 = 500
Ω,
R2 = 500
Ω,
TA = MIN to MAX †
UNIT
MIN
TYP
MAX
MIN
MAX
tPLH
AorB
BorA
2.5
4.2
7.5
2.5
8
ns
tPHL
A or B
B or A
3
4
7.5
3
8
ns
tPLH
A
PARITY
6
8.4
14
6
16
ns
tPHL
A
PARITY
6.8
8.5
15
6.8
16
ns
tPLH
ODD/EVEN
PARITY ERR
4
6.4
11
4
12
ns
tPHL
ODD/EVEN
PARITY, ERR
4.5
6.9
11.5
4.5
12.5
ns
tPLH
B
ERR
8
12.7
20.5
7.5
22.5
ns
tPHL
B
ERR
8
13.4
20.5
7.5
22.5
ns
tPLH
PARITY
ERR
6
8.1
15.5
6
16.5
ns
tPHL
PARITY
ERR
7.5
8.8
15.5
7.5
17
ns
tPZH
OE
A B PARITY or ERR‡
3
5.3
8
3
9
ns
tPZL
OE
A, B, PARITY, or ERR‡
4
5.4
9.5
4
11
ns
tPHZ
OE
A B PARITY or ERR‡
2
4.2
7.5
2
8
ns
tPLZ
OE
A, B, PARITY, or ERR‡
2
3.7
6
2
6.5
ns
† For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
‡ These delay times reflect the 3-state recovery time only and not the signal through the buffers or parity check circuitry. To assure valid information
at the ERR output pin, time must be allowed for the signal to propagate through the drivers (B to A), and to the ERR output. Valid data at the ERR
output is greater than or equal to (B to A) + (A to PARITY).
NOTE 2: Load circuits and waveforms are shown in Section 1.


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