Data Sheet
October 1998
Dual Differential Transceivers
BTK1A, BTL1A, and BTM1A
Features
Driver Features
s
s
Description
The BTK1A, BTL1A, and BTM1A devices are dual
differential transceiver circuits that transmit and
receive digital data over balanced transmission lines
and are compatible with Lucent Technologies Micro-
electronics Group quad differential drivers and
receivers. The dual drivers translate input TTL logic
levels to differential pseudo-ECL output levels. The
dual receivers convert differential input logic levels to
TTL output levels. Each driver/receiver pair has its
own common enable control allowing serial data and
a control clock to be transmitted and received on a
single integrated circuit. The BTK1A transceiver
requires the customer to supply termination resistors
on the circuit board. The BTL1A transceiver has an
internal 220
Ω
termination resistor connected to
ground on each driver output and is equivalent to the
8923A device. The BTM1A transceiver has an inter-
nal resistor termination for both the driver outputs
(220
Ω)
and receiver inputs (110
Ω),
eliminating the
need for external resistors on the circuit board when
used with 100
Ω
impedance, twisted-pair (or flat)
cable. These transceivers replace the Lucent 41
Series transceivers.
The powerdown loading characteristics of the
receiver input circuit are approximately 8 kΩ relative
to the power supplies; hence, they will not load the
transmission line when the circuit is powered down.
For those circuits with termination resistors, the line
will remain impedance matched when the circuit is
powered down. The driver does not load the line
when it is powered down.
The packaging options that are available for the
dual differential transceivers include a 16-pin DIP; a
16-pin, J-lead SOJ; a 16-pin, gull-wing SOIC; and a
16-pin, narrow-body, gull-wing SOIC.
Two line drivers per package
Logic to convert TTL input logic levels to differen-
tial, pseudo-ECL output logic levels
No line loading when V
CC
= 0 V
High output driver for 50
Ω
loads
200 mA short-circuit current (typical)
2.0 ns maximum propagation delay
<0.2 ns output skew (typical)
s
s
s
s
s
Receiver Features
s
s
s
Two line receivers per package
High input impedance
≅
8 kΩ
Logic that converts differential input logic levels to
TTL output logic levels
4.0 ns maximum propagation delay
<0.20 V input sensitivity (typical)
−1.2
V to
+7.2
V common-mode range
s
s
s
Common Device Features
s
s
Common enable for each driver/receiver pair
Operating temperature range: –40
°C
to +125
°C
(wider than the 41 Series)
Single 5.0 V
±
10% supply
400 Mbits/s maximum data rate
Meets ESDI standards
ESD performance better than the 41 Series
Lower power requirement than the 41 Series
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Dual Differential Transceivers
BTK1A, BTL1A, and BTM1A
Data Sheet
October 1998
Pin Information
RO1
DI1
V
CC
ED
ER
GND
DI2
RO2
1
R1
2
3
D1
4
5
D2
6
7
R2
8
BTK1A
16 RI1
15 RI1
14 DO1
13 DO1
12 DO2
11 DO2
10 RI2
9
RI2
RO1
DI1
V
CC
ED
ER
GND
DI2
RO2
1
R1
2
3
D1
4
5
D2
6
7
R2
8
BTL1A
16 RI1
15 RI1
14 DO1
13 DO1
12 DO2
11 DO2
10 RI2
9
RI2
RO1
DI1
V
CC
ED
ER
GND
DI2
RO2
1
R1
2
3
D1
4
5
D2
6
7
R2
8
BTM1A
16 RI1
15 RI1
14 DO1
13 DO1
12 DO2
11 DO2
10 RI2
9
RI2
12-2747aF
Figure 1. Differential Transceiver Logic Diagrams
Table 1. Enable Truth Table
ED
0
1
0
1
ER
0
0
1
1
D1
Active
Disabled
Active
Disabled
D2
Active
Disabled
Active
Disabled
R1
Active
Active
Disabled
Disabled
R2
Active
Active
Disabled
Disabled
Absolute Maximum Ratings
Stresses in excess of the absolute maximum ratings can cause permanent damage to the device. These are abso-
lute stress ratings only. Functional operation of the device is not implied at these or any other conditions in excess
of those given in the operational sections of the data sheet. Exposure to absolute maximum ratings for extended
periods can adversely affect device reliability.
Parameter
Power Supply Voltage
Ambient Operating Temperature
Storage Temperature
Symbol
V
CC
T
A
T
stg
Min
—
−40
−55
Max
6.5
125
150
Unit
V
°C
°C
2
Lucent Technologies Inc.
Data Sheet
October 1998
Dual Differential Transceivers
BTK1A, BTL1A, and BTM1A
Electrical Characteristics
For variations in electrical characteristics over the temperature range, see Figures 10 through 12.
Table 2. Power Supply Current Characteristics
T
A
=
−40
°C to +125 °C, V
CC
= 5 V
±
0.5 V.
Parameter
Power Supply Current (V
CC
= 5.5 V):
All Outputs Disabled:
BTK1A
BTL1A, BTM1A
All Outputs Enabled:
BTK1A
BTL1A, BTM1A
Symbol
Min
Typ
Max
Unit
I
CC
I
CC
I
CC
I
CC
40
80
20
80
65
115
35
115
mA
mA
mA
mA
Third State
These drivers produce pseudo-ECL levels, and the third-state mode is different than the conventional TTL devices.
When a driver is placed in the third state, the bases of the output transistors are pulled low, bringing the outputs
below the active-high and active-low levels. This voltage is typically 2 V for most drivers. In the bidirectional bus
application, the driver of one device, which is in its third state, may be back driven by another driver on the bus
whose voltage in the low state is lower than the third-stated device. This could come about due to differences in the
drivers’ independent power supplies. In this case, the device in the third state will control the line, thus clamping the
line and reducing the signal swing. If the difference voltage between the independent power supplies and the
drivers is small, then this consideration can be ignored. In the typical case, the difference voltage can be as much
as 1 V without significantly affecting the amplitude of the driving signal.
Lucent Technologies Inc.
3
Dual Differential Transceivers
BTK1A, BTL1A, and BTM1A
Data Sheet
October 1998
Electrical Characteristics
(continued)
Table 3. Driver Voltage and Current Characteristics
For variations in output voltage over the temperature range, see Figures 10 and 11. T
A
=
−40
°C to +125 °C.
Parameter
Output Voltages:
Low*
High*:
Differential Voltage (V
OH
– V
OL
)
Third State, I
OH
= –1.0 mA, V
CC
= 4.5 V
Output Voltages (T
A
= 0 °C to 85 °C):
Low*
High*:
Differential Voltage (V
OH
– V
OL
)
Input Voltages:
Low, V
CC
= 5.5 V:
Data Input
Enable Input
High, V
CC
= 4.5 V
Clamp, V
CC
= 4.5 V, I
I
= –5.0 mA
Short-circuit Output Current, V
CC
= 5.5 V
Input Currents, V
CC
= 5.5 V:
Low, V
I
= 0.4 V
High, V
I
= 2.7 V
Reverse, V
I
= 5.5 V
Output Resistors:
BTL1A and BTM1A
‡
Symbol
V
OL
V
OH
V
DIFF
V
OZ
V
OL
V
OH
V
DIFF
V
IL†
V
IL‡
V
IL‡
V
IH†
V
IK
I
OS§
I
IL
I
IH
I
IH
R
O
Min
V
OH
– 1.4
V
CC
−
1.8
0.65
—
V
OH
– 1.4
V
CC
−
1.5
0.8
—
—
—
2.0
—
–100
—
—
—
—
Typ
V
OH
−
1.1
V
CC
−
1
1.1
V
OL
−
0.5
V
OH
−
1.1
V
CC
−
1
1.1
—
—
—
—
—
—
—
—
—
220
Max
V
OH
−
0.65
V
CC
−
0.8
1.4
V
OL
−
0.2
V
OH
−
0.8
V
CC
−
0.8
1.4
0.8
0.8
0.7
—
−1.0
—
−400
20
100
—
Unit
V
V
V
V
V
V
V
V
V
V
V
V
mA
µA
µA
µA
Ω
* Values are with terminations as per Figure 7.
† The input levels and difference voltage provide zero noise immunity and should be tested only in a static, noise-free environment.
‡ Test must be performed one lead at a time to prevent damage to the device.
4
Lucent Technologies Inc.
Data Sheet
October 1998
Dual Differential Transceivers
BTK1A, BTL1A, and BTM1A
Electrical Characteristics
(continued)
Table 4. Receiver Voltage and Current Characteristics
For variation in minimum V
OH
and maximum V
OL
over the temperature range, see Figure 10.
T
A
=
−40
°C to +125 °C.
Parameter
Output Voltages V
CC
= 4.5 V:
Low, I
OL
= 8.0 mA*
High, I
OH
=
−400 µA
Enable Input Voltages:
Low, V
CC
= 5.5 V
High, V
CC
= 4.5 V
Clamp, V
CC
= 4.5 V, I
I
= –5.0 mA
Minimum Differential Input Voltages, V
IH –
V
IL
:
†
−0.80
V < V
IH
< 7.2 V,
−1.2
V < V
IL
< 6.8 V
Input Offset Voltage
Output Currents, V
CC
= 5.5 V:
Off-state (high Z), V
O
= 0.4 V
Off-state (high Z), V
O
= 2.4 V
Short Circuit
Enable Input Currents, V
CC
= 5.5 V:
Low, V
IN
= 0.4 V
High, V
IN
= 2.7 V
Reverse, V
IN
= 5.5 V
Differential Input Currents, (BTK1A, BTM1A):
Low, V
IN
= –1.2 V
High, V
IN
= 7.2 V
Differential Input Impedance (BTM1A):
Connected Between RI and RI
Symbol
V
OL
V
OH
V
IL
*
V
IH
*
V
IK
V
TH
*
V
OFF
I
OZL
I
OZH
I
OS‡
I
IL
I
IH
I
IH
I
IL
I
IH
R
1
Min
—
2.4
—
2.0
—
—
—
—
–25
—
—
—
—
—
—
Typ
—
—
—
—
—
0.1
0.03
—
—
—
—
—
—
—
—
110
Max
0.5
—
0.7
—
−1.0
0.20
0.05
–20
20
–100
–400
20
100
−1.0
1.0
—
Unit
V
V
V
V
V
V
V
µA
µA
mA
µA
µA
µA
mA
mA
Ω
* The input levels and difference voltage provide zero noise immunity and should be tested only in a static, noise-free environment.
† Outputs of unused receivers assume a logic 1 level when the inputs are left open. (It is recommended that all unused positive inputs
be tied to the positive power supply. No external series resistor is required.)
‡ Test must be performed one lead at a time to prevent damage to the device.
Lucent Technologies Inc.
5
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