參數(shù)資料
型號： 74F657
廠商： NXP Semiconductors N.V.
英文描述： Octal transceiver with 8-bit parity generator/checker(帶8位奇偶發(fā)生器/校驗器的八收發(fā)器)
中文描述： 八路收發(fā)器帶有8位奇偶發(fā)生器/檢查（帶8位奇偶發(fā)生器/校驗器的八收發(fā)器）
文件頁數(shù)： 7/12頁
文件大?。?/td> 109K
代理商： 74F657
Philips Semiconductors
Product specification
74F657
Octal transceiver with 8-bit parity generator/checker
90 July 30
7
AC ELECTRICAL CHARACTERISTICS
LIMITS
T
amb
= +25
°
C
V
CC
= +5.0V
C
L
= 50pF,
R
L
= 500
MIN
TYP
T
amb
= 0
°
C to +70
°
C
V
CC
= +5.0V
±
10%
C
L
= 50pF,
R
L
= 500
MIN
T
amb
= –40
°
C to +85
°
C
V
CC
= +5.0V
±
10%
C
L
= 50pF,
R
L
= 500
MIN
SYMBOL
PARAMETER
TEST
UNIT
CONDITION
MAX
MAX
MAX
t
PLH
t
PHL
Propagation delay
An to Bn or Bn to An
Waveform 2
2.5
3.0
5.5
6.0
7.5
7.5
2.5
3.0
8.0
8.0
2.0
2.5
9.0
9.0
ns
t
PLH
t
PHL
Propagation delay
An to PARITY
Waveform 1, 2
7.0
7.0
10.0
10.0
14.0
15.0
7.0
7.0
16.0
16.0
5.5
6.5
16.5
19.0
ns
t
PLH
t
PHL
Propagation delay
ODD/EVEN to PARITY,
ERROR
Waveform 1, 2
4.5
4.5
7.5
8.0
11.0
11.5
4.5
4.5
12.0
12.5
3.5
4.0
13.0
15.5
ns
t
PLH
t
PHL
Propagation delay
Bn to ERROR
Waveform 1, 2
8.0
8.0
14.0
14.0
20.5
20.5
7.5
7.5
22.5
22.5
7.5
7.5
24.5
25.0
ns
t
PLH
t
PHL
Propagation delay
PARITY to ERROR
Waveform 1, 2
8.0
8.0
11.5
12.0
15.5
15.5
7.5
8.0
16.5
17.0
6.5
6.5
18.5
20.0
ns
t
PZH
t
PZL
t
PHZ
t
PLZ
Note to AC electrical characteristics
1. These delay times reflect the 3-state recovery time only and not the signal through the buffers or the parity check circuitry. To assure VALID
information at the ERROR pin, time must be allowed for the signal to propagate through the drivers (B to A), through the parity check circuitry
(same as A to PARITY), and to the ERROR output. VALID data at the ERROR pin > (B to A) + (A to PARITY).
Output enable time
1
to high or low level
Waveform 3, 4
3.0
4.0
5.5
7.0
8.0
9.5
3.0
4.0
9.0
11.0
2.0
4.0
9.0
13.0
ns
Output disable time
from high or low level
Waveform 3, 4
2.0
2.0
4.5
4.0
7.5
6.0
2.0
2.0
8.0
6.5
1.0
1.0
8.0
7.5
ns
AC WAVEFORMS
V
M
V
M
V
M
V
M
t
PLH
t
PHL
An, Bn,
ODD/EVEN,
PARITY
PARITY,
ERROR
SF00418
Waveform 1. Propagation delay for inverting outputs
V
M
V
M
V
M
V
M
t
PHL
t
PLH
A
, B
PARITY,
ERROR
An, Bn,
ODD/EVEN,
PARITY
SF00420
Waveform 2. Propagation delay for non-Inverting outputs
V
M
V
M
V
M
t
PHZ
t
PZH
OE
V
OH
-0.3V
0V
An, Bn,
PARITY,
ERROR
SF00419
Waveform 3. 3-state output enable time to high level and output
disable time from high level
V
M
V
M
V
M
t
PLZ
t
PZL
OE
V
OL
+0.3V
3.5V
An, Bn,
PARITY,
ERROR
SF00421
Waveform 4. 3-state output enable time to low level and output
disable time from low level
Note to AC waveforms
1. For all waveforms, V
M
= 1.5V.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
74F657 WAF 制造商:Fairchild Semiconductor Corporation 功能描述:
74F657N 制造商:Misc 功能描述:
74F657SC 功能描述:總線收發(fā)器 Octal Bidir Trans RoHS:否 制造商:Fairchild Semiconductor 邏輯類型:CMOS 邏輯系列:74VCX 每芯片的通道數(shù)量:16 輸入電平:CMOS 輸出電平:CMOS 輸出類型:3-State 高電平輸出電流:- 24 mA 低電平輸出電流:24 mA 傳播延遲時間:6.2 ns 電源電壓-最大:2.7 V, 3.6 V 電源電壓-最小:1.65 V, 2.3 V 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-48 封裝:Reel
74F657SCX 功能描述:總線收發(fā)器 Octal Bidir Trans RoHS:否 制造商:Fairchild Semiconductor 邏輯類型:CMOS 邏輯系列:74VCX 每芯片的通道數(shù)量:16 輸入電平:CMOS 輸出電平:CMOS 輸出類型:3-State 高電平輸出電流:- 24 mA 低電平輸出電流:24 mA 傳播延遲時間:6.2 ns 電源電壓-最大:2.7 V, 3.6 V 電源電壓-最小:1.65 V, 2.3 V 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-48 封裝:Reel
74F657SDC 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Single 8-bit Bus Transceiver
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