January 1992
Revised August 2000
100397
Quad Differential ECL/TTL Translating Transceiver
with Latch
General Description
Features
■ Differential ECL input/output structure
The 100397 is a quad latched transceiver designed to con-
vert TTL logic levels to differential F100K ECL logic levels
and vice versa. This device was designed with the capabil-
ity of driving a differential 25Ω ECL load with cutoff capabil-
ity, and will sink a 64 mA TTL load. The 100397 is ideal for
mixed technology applications utilizing either an ECL or
TTL backplane.
■ 64 mA FAST TTL outputs
■ 25Ω differential ECL outputs with cut-off
■ Bi-directional translation
■ 2000V ESD protection
■ Latched outputs
The direction of translation is set by the direction control
pin (DIR). The DIR pin on the 100397 accepts F100K ECL
logic levels. An ECL LOW on DIR sets up the ECL pins as
inputs and TTL pins as outputs. An ECL HIGH on DIR sets
up the TTL pins as inputs and ECL pins as outputs.
■ 3-STATE outputs
■ Voltage compensated operating range = −4.2V to −5.7V
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 trans-
parent.
The cut-off state is designed to be more negative than a
normal ECL LOW level. This allows the output emitterfol-
lowers to turn off when the termination supply is −2.0V, pre-
senting 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 100397 is designed with FAST 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.
Ordering Code:
Order Number Package Number
Package Description
100397PC
100397QC
100397QI
N24E
V28A
V28A
24-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-010, 0.400 Wide
28-Lead Plastic Lead Chip Carrier (PLCC), JEDEC MO-047, 0.450 Square
28-Lead Plastic Lead Chip Carrier (PLCC), JEDEC MO-047, 0.450 Square
Industrial Temperature Range (−40°C to +85°C)
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
FAST is a registered trademark of Fairchild Semiconductor Corporation.
© 2000 Fairchild Semiconductor Corporation
DS010971
www.fairchildsemi.com
ROCHESTER [ Rochester Electronics ]
