UM488_15 Datasheet, PDF (8/17 Pages) Union Semiconductor, Inc. – Enhanced Slew-Rate Limiting Facilitates Error-Free Data Transmission

UM488/UM491
Pin Description
Symbol
NC
RO
_______
RE
DE
DI
GND
GND
NC
Y
Z
B
A
NC
VCC
Pin Number
UM488 UM491
-
1
2
2
-
3
-
4
3
5
4
6
4
7
-
8
5
9
6
10
7
11
8
12
-
13
1
14
Function
Not Connected
________
Receiver Output. When R E is low and if A - B ≥-50mV, RO
will be high; if A - B ≤ -200mV, RO will be low.
______
Receiver Output Enable. Drive RE low to enable RO; RO is
______
______
high impedance when RE is high. Drive RE high and DE
low to enter low-power shutdown mode.
Driver Output Enable. Drive DE high to enable driver outputs.
______
These outputs are high impedance when DE is low. Drive RE
high and DE low to enter low-power shutdown mode.
Driver Input. With DE high, a low on DI forces non-inverting
output low and inverting output high. Similarly, a high on DI
forces non-inverting output high and inverting output low.
Ground
Ground
Not Connected
Non-inverting Driver Output
Inverting Driver Output
Inverting Receiver Input
Non-inverting Receiver Input
Not Connected
Positive Supply 4.75V ≤ VCC≤ 5.25V
Functions Tables
TRANSMITTING
INPUTS
OUTPUTS
______
RE
DE
DI
Z
Y
X
1
1
0
1
X
1
0
1
0
0
0
X
High-Z
High-Z
1
0
X
Shutdown
RECEIVING
INPUTS
OUTPUT
______
RE
DE
A-B
RO
0
X
≥-0.05V
1
0
X
≤-0.2V
0
0
X
Open/Short
1
1
1
X
High-Z
1
0
X
Shutdown
________________________________________________________________________
http://www.union-ic.com Rev.05 Dec.2014
8/17