STC3485E Datasheet Rev.0.1, Dec.2005
Page of 11
5
STC International Limited http://www.mcu-memory.com
Pin Description
Figure 1. STC3485E Pin Configuration and Typical Operating Circuit
Figure 2. Driver VOD and VOC
Figure 3. Driver VOD with Varying Common-Mode Voltage
Figure 4. Receiver VOH and VOL
PIN
NAME
FUNCTION
1
RO
Receiver Output. If A > B by -50mV, RO will be high; if A < B by 200mV, RO will be low.
2
/RE
Receiver Output Enable. RO is enabled when RE is low; RO is high impedance when RE is high. If RE
is high and DE is low, the device will enter a low-power shutdown mode.
3
DE
Driver Output Enable. The driver outputs are enabled by bringing DE high. They are high impedance
when DE is low. If /RE is high and DE is low, the device will enter a low-power shutdown mode. 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.
4
DI
Driver Input. A low on DI forces output B high and output A low. Similarly, a high on DI forces output
B low and output A high.
5
GND
Ground
6
A
Noninverting Receiver Input and Noninverting Driver Output
7
B
Inverting Receiver Input and Inverting Driver Output
8
VCC
Positive Supply: 3.0V≤VCC≤3.6V
1
RO
Vcc
8
2
RE
B
7
3
DE
A
6
4
DI
GND
5
R
D
SO/DIP
B
Rt
A
D
R
DE
DI
RO
RE
1
RO
Vcc
8
2
RE
B
7
3
DE
A
6
4
DI
GND
5
R
D
STC3485E
Rt
TOP VIEW
VDD
VCC
RL
2
VCC
RL
2
D
VCC
VDD
D
RL
375 Ω
375 Ω
VCM=
-7V to +12V
VID
R
OV
VOL
ICL
(+)
VOH
IOH
(-)