Agere Systems Inc.

3

Data Sheet

January 1999

BDG1A, BDP1A, BDGLA, BPNGA, BPNPA, and BPPGA

Quad Differential Drivers

Electrical Characteristics

For electrical characteristics over the entire temperature range, see Figures 7 through 9.

Table 2. Power Supply Current Characteristics

± 0.5 V.

* Measured with no load (BPPGA has no load on drivers C and D).

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.

Parameter

Symbol

Min

Typ

Max

Unit

All Outputs Disabled:

BDG1A*, BPNGA*



45

65

mA



120

160

mA

BDGLA*



35

55

mA



85

115

mA

All Outputs Enabled:

BDG1A*, BPNGA*



25

40

mA



150

200

mA

BDGLA*



14

20

mA



90

115

mA