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Low-Voltage Functional Replacements for the
Agere BRF1A, BRF2A, BRS2A, and BRS2B
Pin-Equivalent to General Trade 26LS32 De-
vices
High-Input Impedance Approximately 8 k
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
±
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
°
C to 85
°
C
Available SOIC (D) Package
PIN ASSIGNMENTS
APPLICATIONS
Digital Data or Clock Transmission Over Bal-
anced Lines
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
AI
AI
AO
E1
BO
BI
BI
GND
VCC
DI
DI
DO
E2
CO
CI
CI
D PACKAGE
(TOP VIEW)
DESCRIPTION
These quad differential receivers accept digital data
over balanced transmission lines. They translate
differential input logic levels to TTL output logic
levels.
AI
AO
BO
CO
DO
AI
BI
BI
C1
D1
C1
D1
E2
E1
ENABLE TRUTH TABLE
TB3R1, TB3R2
SLLS587B–NOVEMBER 2003–REVISED MAY 2004
QUAD DIFFERENTIAL PECL RECEIVERS
The power-down loading characteristics of the re-
ceiver input circuit are approximately 8 k
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
that are
connected to V
CC
to ensure a logical high level input
if the inputs are open circuited.
FUNCTIONAL BLOCK DIAGRAM
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.
E1
0
1
0
1
E2
0
0
1
1
CONDITION
Active
Active
Disabled
Active
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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 2003–2004, Texas Instruments Incorporated