100398QI

Output Type : 3-State
Maximum Operating Temperature : + 85 C
Low Level Output Current : 24 mA
Number of Channels per Chip : 4
Input Level : TTL
High Level Output Current : - 3 mA
Logic Type : ECL
Logic Family : ECL
Output Level : ECL
Package / Case : PLCC-28
Propagation Delay Time : 5.1 ns
Packaging : Rail
Supply Voltage - Max : - 5.7 V, + 5.5 V
Supply Voltage - Min : - 4.2 V, + 4.5 V


Features:

Differential ECL input/output structure
64 mA FAST TTL outputs
25Ω differential ECL outputs with cut-off
Bi-directional translation
2000V ESD protection
Latched outputs
3-STATE outputs
Voltage compensated operating range = −4.2V to −5.7V


Pinout




Specifications

Storage Temperature (T_STG)............. −65°C to +150°C
Maximum Junction Temperature
    (T_J)............................................................... +150°C
V_EE Pin Potential to Ground Pin .............−7.0V to +0.5V
V_TTL Pin Potential to Ground Pin ...........−0.5V to +6.0V
ECL Input Voltage (DC)............................. V_EE to +0.5V
ECL Output Current
    (DC Output HIGH) .........................................−50 mA
TTL Input Voltage (Note 7).................... −0.5V to +7.0V
TTL Input Current (Note 7) .............−30 mA to +5.0 mA
Voltage Applied to Output
    in HIGH State
    3-STATE Output................................. −0.5V to +5.5V
Current Applied to TTL
    Output in LOW State (Max) twice the Rated I_OL (mA)
ESD (Note 6) .....................................................2000V 


Description

The 100398 is a quad latched transceiver designed to convert TTL logic levels to differential F100K ECL logic levels and vice versa. This device was designed with the capability of driving a differential 25Ω ECL load with cutoff capability, and will sink a 64 mA TTL load. The 100398 is ideal for mixed technology applications utilizing either an ECL or TTL backplane.

The direction of translation is set by the direction control pin (DIR). The DIR pin on the 100398 accepts TTL logic levels. A TTL LOW on DIR sets up the ECL pins as inputs and TTL pins as outputs. A TTL HIGH on DIR sets up the TTL pins as inputs and ECL pins as outputs.

A LOW on the output enable input pin (OE) holds the ECL output in a cut-off state and the TTL outputs at a high impedance level. A HIGH on the latch enable input (LE) latches the data at both inputs even though only one output is enabled at the time. A LOW on LE makes the latch transparent.

The cut-off state is designed to be more negative than a normal ECL LOW level. This allows the output emitter-followers to turn off when the termination supply is −2.0V, presenting a high impedance to the data bus. This high impedance reduces termination power and prevents loss of low state noise margin when several loads share the bus.

The 100398 is designed with FAST^TM TTL output buffers, featuring optimal DC drive and capable of quickly charging and discharging highly capacitive loads. All Inputs have 50 kΩ pull-down resistors.