參數(shù)資料
型號(hào)： MAX3157EPI
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類： 通用總線功能
英文描述： High CMRR RS-485 Transceiver with 【50V Isolation
中文描述： LINE TRANSCEIVER, PDIP28
封裝： 0.300 INCH, PLASTIC, MS-001, DIP-28
文件頁(yè)數(shù)： 9/13頁(yè)
文件大?。?/td> 307K
代理商： MAX3157EPI
M
High CMRR RS-485 Transceiver
with ±50V Isolation
_______________________________________________________________________________________
9
Pin Description
PIN
SSOP
PDIP
NAME
FUNCTION
1
2
RO
Receiver Output. When
RE
is low and A - B > -50mV, RO will be high; if A - B
≤
-200mV,
RO will be low.
2
3
RE
Receiver Output Enable. Drive
RE
low to enable RO.
3
4
DE
Driver Output Enable. Drive DE high to enable driver outputs.
4
5
DI
Driver Input. With DE high, a low on DI forces the noninverting output low and the inverting
output high; with DI high, outputs reverse.
5
6
C1LO
Connect to the negative terminal of C1 (0.047μF, 50V).
6, 7,
12, 22,
23
1, 12,
14, 15,
28
N.C.
No Connection
8
7
C1HI
Connect to the positive terminal of C1 (0.047μF, 50V).
9
8
ISOVCC
Internally generated power-supply voltage, referenced to the cable ground (ISOCOM).
Connect a 1μF capacitor to ISOCOM.
10
9
H/
F
Half/Full-Duplex Selector Pin. Leave open, or connect to ISOCOM to select Full Duplex, or
connect to ISOVCC to select Half Duplex.
11
10
ZR
Connect to ISOCOM for a 1.5k
input impedance on Z. Leave open for a 12k
input
impedance on Z.
13
11
YR
Connect to ISOCOM for a 1.5k
input impedance on Y. Leave open for a 12k
input
impedance on Y.
14
13
ISOCOM
Cable Ground
15
16
Z
Inverting Driver Output (and Inverting Receiver Input in Half-Duplex Mode)
16
17
Y
Noninverting Driver Output (and Noninverting Receiver Input in Half-Duplex Mode)
17
18
B
Inverting Receiver Input in Full-Duplex Mode
18
19
A
Noninverting Receiver Input in Full-Duplex Mode
19
20
BR
Connect to ISOCOM for a 1.5k
input impedance on B. Leave open for a 12k
input
impedance on B.
20
21
AR
Connect to ISOCOM for a 1.5k
input impedance on A. Leave open for a 12k
input
impedance on A.
21
24
25
22
23
24
C2HI
C2LO
GND
Connect to the positive terminal of C2 (0.047μF, 50V).
Connect to the negative terminal of C2 (0.047μF, 50V).
Ground
26
25
TXP
Transmitter Phase. Leave open, or connect to GND for normal transmitter polarity, or connect
to V
CC
to invert the transmitter polarity.
27
26
RXP
Receiver Phase. Leave open, or connect to GND for normal receiver polarity, or connect to
V
CC
to invert the receiver polarity.
+4.75V to +5.25V Positive Supply. Connect a 0.1μF capacitor to GND.
28
27
V
CC
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