National Semiconductor Corp 100398QC

Cross Number:

Item Description:







Technical Document


DISCLAIMER: The information provided herein is solely for informational purposes. Customers must be aware of the suitability of this product for their application, and consider that variable factors such as Manufacturer, Product Category, Date Codes, Pictures and Descriptions may differ from available inventory.

© 2000 Fairchild Semiconductor Corporation DS010970 www.fairchildsemi.com
February 1992
Revised August 2000
100398 Quad Differential ECL/TTL Translating Transceiver with Latch
100398
Quad Differential ECL/TTL Translating Transceiver
with Latch
General Description
The 100398 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 25
ECL load with cutoff capabil-
ity, 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 trans-
parent.
The cut-off state is designed to be more negative than a
normal ECL LOW level. This allows the output emitter-fol-
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 100398 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 k
pull-down resistors.
Features
Differential ECL input/output structure
64 mA FAST TTL outputs
25
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
Ordering Code:
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.
Order Number Package Number Package Description
100398PC N24E 24-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-010, 0.400 Wide
100398QC V28A 28-Lead Plastic Lead Chip Carrier (PLCC), JEDEC MO-047, 0.450 Square
100398QI V28A 28-Lead Plastic Lead Chip Carrier (PLCC), JEDEC MO-047, 0.450 Square
Industrial Temperature Range (
40°C to +85°C)
www.fairchildsemi.com 2
100398
Logic Symbol
Connection Diagrams
24-Pin DIP
28-Pin PLCC
Pin Descriptions
Truth Table
H = HIGH Voltage Level
L = LOW Voltage Level
X = Don’t Care
Z = High Impedance
Note 1: ECL input to TTL output mode.
Note 2: TTL input to ECL output mode.
Note 3: Retains data present before LE set HIGH.
Note 4: Latch is transparent.
Pin Names Description
E
0
E
3
ECL Data I/O
E
0
E
3
Complementary ECL
Data I/O
T
0
T
3
TTL Data I/O
OE Output Enable Input Levels
LE Latch Enable Input Levels
DIR Direction Control
Input (TTL levels)
GNDECL ECL Ground
GNDECLO ECL Output Ground
GNDS ECL Ground-to-Substrate
V
EE
ECL Quiescent Power Supply
V
EED
ECL Dynamic Power Supply
GNDTTL TTL Quiescent Ground
GNDTTLD TTL Dynamic Ground
V
TTL
TTL Quiescent Power Supply
V
TTLD
TTL Dynamic Power Supply
LE DIR OE ECL TTL
Notes
Port Port
000LOWZ
(Cut-Off)
0 0 1 Input Output (Note 1)(Note 4)
010LOWZ
(Cut-Off)
0 1 1 Output Input (Note 2)(Note 4)
1 0 0 Input Z (Note 1)(Note 3)
1 0 1 Latched X (Note 1)(Note 3)
1 1 0 Low Input (Note 2)(Note 3)
(Cut-Off)
1 1 1 Latched X (Note 2)(Note 3)
3 www.fairchildsemi.com
100398
Functional Diagram
Note: LE, and OE use TTL logic levels
Detail
12345NEXT

Freelance Electronics
13197 Sandoval Street
Santa Fe Springs, CA 90670

Hours of Operation
Monday-Friday 7:30am-4:30pm PST
(Deadline for next day shipment 2:00pm PST)

Trustworthy Standards Serving the Electronic Components
Industry since 1986

Government Cage code#-1V4R6
Duns Number# 788130532
Certified Small Disadvantaged Business