ISL32600EFUZ-T7A Intersil, ISL32600EFUZ-T7A Datasheet - Page 11

• Manufacturer Part Number: ISL32600EFUZ-T7A
• Description: RS-422/RS-485 Interface IC RS-485/422 SERIAL TRANSCEIVER IC
• Manufacturer: Intersil

Specifications of ISL32600EFUZ-T7A

• Rohs: yes
• Data Rate: 128 Kbps to 256 Kbps
• Operating Supply Voltage: 2.7 V to 3.6 V
• Supply Current: 120 uA
• Operating Temperature Range: - 40 C to + 125 C
• Mounting Style: SMD/SMT
• Package / Case: MSOP-10
• Function: Full Duplex
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 40 C

Test Circuits and Waveforms
Application Information
RS-485 and RS-422 are differential (balanced) data
transmission standards for use in long haul or noisy
environments. RS-422 is a subset of RS-485, so RS-485
transceivers are also RS-422 compliant. RS-422 is a
point-to-multipoint (multidrop) standard, which allows only one
driver and up to 10 (assuming one unit load devices) receivers
on each bus. RS-485 is a true multipoint standard, which
allows up to 32 one-unit load devices (any combination of
drivers and receivers) on each bus. To allow for multipoint
operation, the RS-485 spec requires that drivers must handle
bus contention without sustaining any damage.
SIGNAL
GENERATOR
SIGNAL
GENERATOR
t
t
ZH(SHDN)
ZL(SHDN)
t
PARAMETER
t
ZH
ZL
V
CC
(Note 10)
(Note 10)
SIGNAL
GENERATOR
t
t
HZ
LZ
(Note 11)
(Note 13)
DE
DI
GND
GND
FIGURE 6A. TEST CIRCUIT
FIGURE 7A. TEST CIRCUIT
FIGURE 8A. TEST CIRCUIT
RE
D
ISL32600E, ISL32601E, ISL32602E, ISL32603E
B
A
B
A
Z
Y
RE
R
DE
X
X
0
0
0
0
11
R
RO
R
DIFF
RO
+1.5V
+1.5V
+1.5V
-1.5V
-1.5V
-1.5V
FIGURE 7. RECEIVER PROPAGATION DELAY AND DATA RATE
A
15pF
FIGURE 8. RECEIVER ENABLE AND DISABLE TIMES
50pF
1kΩ
15pF
SW
GND
GND
GND
FIGURE 6. DRIVER DATA RATE
V
V
SW
V
CC
CC
CC
(Continued)
V
GND
V
OD
+
CC
-
Another important advantage of RS-485 is the extended
common mode range (CMR), which specifies that the driver
outputs and receiver inputs withstand signals that range from
-7V to +12V. RS-422 and RS-485 are intended for runs as long
as 4000’, so the wide CMR is necessary to handle ground
potential differences, as well as voltages induced in the cable
by external fields.
Receiver Features
These devices utilize a differential input receiver for maximum
noise immunity and common mode rejection. Input sensitivity is
better than ±200mV, as required by the RS-422 and RS-485
specifications. The symmetrical ±200mV switching thresholds
t
t
ZH
ZL
RO
A
NOTE 11
NOTE 11
DIFF OUT (Y - Z)
RE
RO
RO
, t
, t
ZH(SHDN)
ZL(SHDN)
DI
NOTE 11
FIGURE 6B. MEASUREMENT POINTS
FIGURE 7B. MEASUREMENT POINTS
FIGURE 8B. MEASUREMENT POINTS
t
PLH
0V
-V
50%
OD
OUTPUT HIGH
50%
1.5V
1.5V
OUTPUT LOW
t
PHL
t
t
0V
HZ
LZ
50%
50%
V
V
OH
OL
+V
- 0.25V
+ 0.25V
+1V
-1V
V
OD
0V
June 22, 2012
CC
V
0V
V
FN7967.0
CC
0V
0V
V
V
V
CC
0V
OH
CC
OL