Datasheet SY100ELT25 Datasheet (MICREL)

DIFFERENTIAL
ECL-to-TTL
TRANSLATOR

SY100ELT25

FEATURES

■ 2.6ns typical propagation delay

■ Differential ECL inputs

■ 24mA TTL outputs

■ Flow-through pinouts

■ Available in 8-pin SOIC package

PIN CONFIGURATION/BLOCK DIAGRAM

EE

V

1

2

D

3

D

8

V

CC

7

Q

NC

6

DESCRIPTION

The SY100ELT25 is a differential ECL-to-TTL
translator. Because ECL levels are used, a +5V, –5.2V
(or –4.5V) and ground are required. The small outline 8­lead SOIC package and the single gate of the ELT25
makes it ideal for those applications where performance,
space and low power are at a premium.

The VBB output allows the ELT25 to also be used in a
single-ended input mode. In this mode the VBB output is
tied to the D input for a non-inverting buffer or the D
input for an inverting buffer. If used the VBB pin should
be bypassed to ground via a 0.01µF capacitor.

PIN NAMES

Pin Function

Q TTL Output
D Differential ECL Inputs
VCC Positive Supply
VEE Negative Supply
VBB Reference Output
GND Ground

BB

V

4

SOIC

TOP VIEW

5

GND

Rev.: A Amendment: /0

1

Issue Date: October 1999

Micrel

SY100ELT25

ABSOLUTE MAXIMUM RATINGS

(1)

Symbol Paramter Value Unit

VCC Power Supply Voltage –0.5 to +7.0 V
VIN ECL Input Voltage VEE to GND+0.5 V

OUT Voltage Applied to –0.5 to +5.5 V

V

Output at HIGH State

OUT Current Applied to Twice the mA

I

Output at LOW State Rated IOL
Tstore Storage Temperature –65 to +150 °C
T

A Operating Temperature –40 to +85 °C

NOTE:

1. Permanent device damage may occur if ABSOLUTE MAXIMUM RATINGS
are exceeded. This is a stress rating only and functional operation is not
implied at conditions other than those detailed in the operational sections
of this data sheet. Exposure to ABSOLUTE MAXIMUM RATlNG conditions
for extended periods may affect device reliability.

DC ELECTRICAL CHARACTERISTICS

VCC = 4.5V to 5.5V; VEE = –4.2V to –5.5V

TRUTH TABLE

DD Q

LH L

HL H

Open Open L

TA = –40°CTA = 0°CTA = +25°CTA = +85°C

Symbol Parameter Min. Max. Min. Max. Min. Max. Min. Max. Unit Condition

ICC Power Supply Current — 14 — 14 9 14 — 14 mA —
I

EE Power Supply Current — 14 — 14 5.5 14 — 14 mA —

AC ELECTRICAL CHARACTERISTICS

VCC = 4.5V to 5.5V; VEE = –4.2V to –5.5V

TA = –40°CTA = 0°CTA = +25°CTA = +85°C

Symbol Parameter Min. Max. Min. Max. Min. Max. Min. Max. Unit Condition

PLH Propagation Delay 1.7 3.6 1.7 3.6 1.7 3.6 1.7 3.6 ns CL = 20pF

t
tPHL D to Output Q

fMAX Maximum Frequency 150 — 150 — 150 — 150 — MHz CL = 20pF

r Output Rise/Fall Time — 1.5 — 1.5 — 1.5 — 1.5 ns CL = 20pF

t
tf (1.0V to 2.0V)

TTL DC ELECTRICAL CHARACTERISTICS

VCC = 4.5V to 5.5V; VEE = –4.2V to –5.5V

TA = –40°CTA = 0°CTA = +25°CTA = +85°C

Symbol Parameter Min. Max. Min. Max. Min. Max. Min. Max. Unit Condition

VOH Output HIGH Voltage 2.4 — 2.4 — 2.4 — 2.4 — VIOH = –3.0mA
VOL Output LOW Voltage — 0.5 — 0.5 — 0.5 — 0.5 V IOL = 24mA

OS Output Short Circuit Current –60 –200 –60 –200 –60 –200 –60 –200 mA VOUT = 0V

I

2

Micrel

SY100ELT25

ECL DC ELECTRICAL CHARACTERISTICS

VCC = 4.5V to 5.5V; VEE = –4.2V to –5.5V

A = –40°CTA = 0°CTA = +25°CTA = +85°C

T

Symbol Parameter Min. Typ. Max. Min. Typ. Max. Min. Typ. Max. Min. Typ. Max. Unit

IIH Input HIGH Current ——150 ——150 ——150 ——150 µA
IIL Input HIGH Current 0.5 —— 0.5 —— 0.5 —— 0.5 —— µA
VCMR Common Mode Range VEE+2.2 — GND VEE+2.2 — GND VEE+2.2 — GND VEE+2.2 — GND V

PP Minimum Peak-to-Peak 200 —— 200 —— 200 —— 200 ——mV

V

VIH Input HIGH Voltage –1165 —–880 –1165 —–880 –1165 —–880 –1165 —–880 mV
VIL Input LOW Voltage –1810 —–1475 –1810 —–1475 –1810 —–1475 –1810 —–1475 mV

BB Reference Output –1.38 —–1.26 –1.38 —–1.26 –1.38 —–1.26 –1.38 —–1.26 mV

V

NOTE:

1. 200mV input guarantees full logic at output.

Input

(1)

TTL SWITCHING CIRCUIT

Use 0.1µF Capacitors
For Decoupling

PULSE

GENERATOR

Use Oscilloscope Internal
50Ω Load For Termination

V

EE VCC

50Ω COAX

IN OUT

DEVICE

UNDER

50Ω COAX 50Ω COAX

CH A

OSCILLOSCOPE

TEST

450Ω

CH B

3

Micrel

ECL/TTL PROPAGATION DELAY — SINGLE ENDED

50%
V

IN

PLH

t

1.5V

V

OUT

ECL/TTL WAVEFORMS: RISE AND FALL TIMES

t

PHL

SY100ELT25

2.0V

V

OUT

t

t

r

f

1V

PRODUCT ORDERING CODE

Ordering Package Operating

Code Type Range

SY100ELT25ZC Z8-1 Commercial
SY100ELT25ZCTR Z8-1 Commercial

4

Micrel

8 LEAD SOIC .150" WIDE (Z8-1)

SY100ELT25

Rev. 03

MICREL-SYNERGY 3250 SCOTT BOULEVARD SANTA CLARA CA 95054 USA

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© 2000 Micrel Incorporated

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