MAX1487CSA Datasheet, PDF (7/17 Pages) Maxim Integrated Products – Low-Power, Slew-Rate-Limited RS-485/RS-422 Transceivers

MAX481/MAX483/MAX485
MAX487–MAX491/MAX1487
Low-Power, Slew-Rate-Limited
RS-485/RS-422 Transceivers
______________________________________________________________Pin Description
MAX481/MAX483/
MAX485/MAX487/
MAX1487
DIP/SO µMAX
PIN
MAX488/
MAX490
DIP/SO µMAX
1
3
2
4
2
4
—
—
3
5
—
—
4
6
3
5
5
7
4
6
—
—
5
7
—
—
6
8
6
8
—
—
—
—
8
2
7
1
—
—
—
—
7
1
8
2
1
3
—
—
—
—
MAX489/
MAX491
NAME
NAME
DIP/SO
2
RO
3
RE
4
DE
5
6, 7
9
10
—
12
—
11
14
1, 8, 13
DI
GND
Y
Z
A
A
B
B
V_CC
N.C.
FUNCTION
FUNCTION
Receiver Output: If A > B by 200mV, RO will be high;
If A < B by 200mV, RO will be low.
Receiver Output Enable. RO is enabled when RE is low; RO is
high impedance when RE is high.
Driver Output Enable. The driver outputs, Y and Z, are enabled
by bringing DE high. They are high impedance when DE is low. If
the driver outputs are enabled, the parts function as line drivers.
While they are high impedance, they function as line receivers if
RE is low.
Driver Input. A low on DI forces output Y low and output Z high.
Similarly, a high on DI forces output Y high and output Z low.
Ground
Noninverting Driver Output
Inverting Driver Output
Noninverting Receiver Input and Noninverting Driver Output
Noninverting Receiver Input
Inverting Receiver Input and Inverting Driver Output
Inverting Receiver Input
Positive Supply: 4.75V ≤ V_CC ≤ 5.25V
No Connect—not internally connected
TOP VIEW
RO 1
RE 2
DE ³
DI ⁴
R
D
DIP/SO
B1
V_{CC 2}
RO 3
RE 4
MAX481
MAX483
MAX485
MAX487
MAX1487
μMAX
8 V_CC
7B
6A
5 GND
8A
RO 1
R
RE 2
DE ³
DI ⁴ D
8 V_CC
7B
Rt
6
A
5 GND
MAX481
MAX483
MAX485
MAX487
MAX1487
B
Rt
DE
DI
D
A
R
RO
7 GND
RE
6 DI
5 ^DE
NOTE: PIN LABELS Y AND Z ON TIMING, TEST, AND WAVEFORM DIAGRAMS REFER TO PINS A AND B WHEN DE IS HIGH.
TYPICAL OPERATING CIRCUIT SHOWN WITH DIP/SO PACKAGE.
Figure 1. MAX481/MAX483/MAX485/MAX487/MAX1487 Pin Configuration and Typical Operating Circuit
Maxim Integrated
7