Data Sheet
January 1999
Quad Differential Drivers
BDG1A, BDP1A, BDGLA, BPNGA, BPNPA, and BPPGA
Features
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Pin-equivalent to the general-trade 26LS31 device,
with improved speed, reduced power consumption,
and significantly lower levels of EMI
Four line drivers per package
Meets ESDI standards
2.0 ns maximum propagation delay
Single 5.0 V
±
10% supply
Operating temperature range:
−40
°C to +125 °C
(wider than the 41 Series)
400 Mbits/s maximum data rate
Logic to convert TTL input logic levels to differen-
tial, pseudo-ECL output logic levels
No line loading when V
CC
= 0 (BDG1A, BDP1A
only)
High output driver for 50
Ω
loads
<0.2 ns output skew (typical)
On-chip 220
Ω
loads available
Third-state outputs available
Surge-protection to ±60 V for 10 ms available
(BPNGA, BPNPA, BPPGA)
Available in four package types
ESD performance better than the 41 Series
Lower power requirement than the 41 Series
26LS31, but offer increased speed, decreased power
consumption, and significantly lower levels of electro-
magnetic interference (EMI). They replace the Agere
41 Series drivers.
The BDG1A device is the generic driver in this family
and requires the user to supply external resistors on
the circuit board for impedance matching.
The BDGLA is a low-power version of the BDG1A,
reducing the power requirement by more than one
half. The BDGLA features a 3-state output with a typ-
ical third-state level of 0.2 V.
The BDP1A is equivalent to the BDG1A but has
220
Ω
termination resistors to ground on each driver
output. This eliminates the need for external pull-
down resistors when driving a 100
Ω
impedance line.
The BPNGA and BPNPA are equivalent to the
BDG1A and BDP1A, respectively, except that a light-
ning protection circuit has been added to the driver
outputs. This circuit will absorb large transitions on
the transmission lines without destroying the device.
The BPPGA combines the features of the BPNGA
and BPNPA. Two of the gates have their outputs ter-
minated to ground through 220
Ω
resistors while the
two remaining gates require external termination
resistors.
When the BDG1A and the BDP1A devices are pow-
ered down, the output circuit appears as an open cir-
cuit relative to the power supplies; hence, they will
not load the transmission line. For those circuits with
termination resistors, the line will remain impedance
matched when the circuit is powered down. The
BPNGA, BPNPA, BPPGA, and BDGLA will load the
transmission line, because of the protection circuit,
when the circuit is powered down.
The packaging options that are available for these
quad differential line drivers 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.
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Description
These quad differential drivers are TTL input-to-
pseudo-ECL-differential-output used for digital data
transmission over balanced transmission lines. All
devices in this family have four drivers with a single
enable control in a common package. These drivers
are compatible with many receivers, including the
Agere Systems Inc. 41 Series receivers and trans-
ceivers. They are pin equivalent to the general-trade
Data Sheet
January 1999
Quad Differential Drivers
BDG1A, BDP1A, BDGLA, BPNGA, BPNPA, and BPPGA
Electrical Characteristics
For electrical characteristics over the entire temperature range, see Figures 7 through 9.
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:
BDG1A*, BPNGA*
BDP1A
†
, BPNPA
†
BDGLA*
BPPGA*
†
All Outputs Enabled:
BDG1A*, BPNGA*
BDP1A
†
, BPNPA
†
BDGLA*
BPPGA*
†
Symbol
Min
Typ
Max
Unit
I
CC
I
CC
I
CC
I
CC
I
CC
I
CC
I
CC
I
CC
45
120
35
85
25
150
14
90
65
160
55
115
40
200
20
115
mA
mA
mA
mA
mA
mA
mA
mA
* Measured with no load (BPPGA has no load on drivers C and D).
† The additional power dissipation is the result of integrating the termination resistors into the device. I
CC
is measured with a 100
Ω
resistor
across the driver outputs (BPPGA has terminating resistors on drivers A and B).
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-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’ indepen-
dent power supplies. In this case, the device in the third state will control the line, thus clamping the line and reduc-
ing 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.
Agere Systems Inc.
3
Quad Differential Drivers
BDG1A, BDP1A, BDGLA, BPNGA, BPNPA, and BPPGA
Data Sheet
January 1999
Electrical Characteristics
(continued)
Table 3. Voltage and Current Characteristics
For the variation in V
OH
and V
OL
over the temperature range, see Figures 7 and 8.
T
A
= –40 °C to +125 °C.*
Parameter
Output Voltages:
Low*
High*:
BDG1A, BDP1A, BPNGA, BPNPA, BPPGA
BDGLA
Differential Voltage (V
OH
– V
OL
)
Output Voltages (T
A
= 0 °C to 85 °C):
Low*
High*:
BDG1A, BDP1A, BPNGA, BPNPA, BPPGA
BDGLA
Differential Voltage (V
OH
– V
OL
)
Third State, I
OH
= –1.0 mA, V
CC
= 4.5 V:
BDG1A, BDP1A, BPNGA, BPNPA, BPPGA
BDGLA
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:
BDP1A, BPNPA, BPPGA
§
*
†
‡
§
Symbol
V
OL
V
OH
V
OH
V
DIFF
V
OL
V
OH
V
OH
V
DIFF
V
OZ
V
OZ
Min
V
OH
– 1.4
V
CC
−
1.8
V
CC
−
2.5
0.65
V
OH
– 1.4
V
CC
−
1.5
V
CC
−
2.5
0.8
—
—
Typ
V
OH
−
1.1
V
CC
−
1
V
CC
−
2
1.1
V
OH
−
1.1
V
CC
−
1
V
CC
−
2
1.1
V
OL
−
0.5
0.2
Max
V
OH
−
0.65
V
CC
−
0.8
V
CC
−
1.6
1.4
V
OH
−
0.8
V
CC
−
0.8
V
CC
−
1.6
1.4
V
OL
−
0.2
0.5
Unit
V
V
V
V
V
V
V
V
V
V
V
IL
†
V
IL
†
V
IH
V
IK
I
OS
‡
I
IL
I
IH
I
IH
R
O
—
—
2.0
—
–100
—
—
—
—
—
—
—
—
—
—
—
—
220
0.8
0.7
—
−1.0
—
−400
20
100
—
V
V
V
V
mA
µA
µA
µA
Ω
Values are with terminations as per Figure 4 or equivalent.
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.
See Figure 1 for BPPGA terminations.
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Agere Systems Inc.
Embedded System
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