High-Input Impedance Approximately 8 k鈩?/div>
3.5-ns Maximum Propagation Delay
TB3R1 Provides 50-mV Hysteresis
TB3R2 With -125-mV Threshold Offset for
Preferred State Output
-0.5-V to 5.2-V Common Mode Range
Single 3.3 V
鹵10%
Supply
Slew Rate Limited (0.5 ns min 80% to 20%)
TB3R2 Output Defaults to Logic 1 When In-
puts Left Open or Shorted to V
CC
or GND
ESD Protection HBM > 3 kV, CDM > 2 kV
Operating Temperature Range: -40擄C to 85擄C
Available SOIC (D) Package
The power-down loading characteristics of the re-
ceiver input circuit are approximately 8 k鈩?relative to
the power supplies; hence they do not load the
transmission line when the circuit is powered down.
The package for these differential line receivers is the
16-pin SOIC (D) package.
The enable inputs of this device include internal
pullup resistors of approximately 40 k鈩?that are
connected to V
CC
to ensure a logical high level input
if the inputs are open circuited.
PIN ASSIGNMENTS
D PACKAGE
(TOP VIEW)
APPLICATIONS
Digital Data or Clock Transmission Over Bal-
anced Lines
AI
AI
AO
E1
BO
BI
BI
GND
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
VCC
DI
DI
DO
E2
CO
CI
CI
FUNCTIONAL BLOCK DIAGRAM
AI
AI
BI
BI
C1
C1
D1
D1
E1
E2
DO
BO
CO
AO
DESCRIPTION
These quad differential receivers accept digital data
over balanced transmission lines. They translate
differential input logic levels to TTL output logic
levels.
The TB3R1 is a pin- and function-compatible replace-
ment for the Agere Systems BRF1A and BRF2A; it
includes 3-kV HBM and 2-kV CDM ESD protection.
The TB3R2 is a pin- and function-compatible replace-
ment for the Agere Systems BRS2A and BRS2B and
incorporates a -125-mV receiver input offset, pre-
ferred state output, 3-kV HBM and 2-kV CDM ESD
protection. The TB3R2 preferred state feature places
the output in the high state when the inputs are open,
shorted to ground, or shorted to the power supply.
ENABLE TRUTH TABLE
E1
0
1
0
1
E2
0
0
1
1
CONDITION
Active
Active
Disabled
Active
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright 漏 2003鈥?004, Texas Instruments Incorporated
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