MICREL SY100EPT21L Datasheet

3.3V DIFFERENTIAL
LVPECL-to-LVTTL
TRANSLATOR

SY100EPT21L

FEATURES

■ 3.3V power supply

■ 1.9ns typical propagation delay

■ 275MHz f

(Clock bit stream, not pseudo-random)

MAX

■ Differential LVPECL inputs

■ 24mA LVTTL outputs

■ Flow-through pinouts

■ Internal input resistors: pulldown on D, pulldown

and pullup on /D

■ Q output will default LOW with inputs open or at

GND

■ VBB output

■ Available in 8-pin MSOP and SOIC package

PIN CONFIGURATION/BLOCK DIAGRAM

DESCRIPTION

The SY100EPT21L is a single differential LVPECL-to­LVTTL translator using a single +3.3V power supply.
Because LVPECL (Low Voltage Positive ECL) levels are
used, only +3.3V and ground are required. The small
outline 8-lead SOIC package and low skew single gate
design make the EPT21L ideal for applications that
require the translation of a clock or data signal where
minimal space, low power, and low cost are critical.

VBB allows a differential, single-ended, or AC-coupled
interface to the device. If used, the VBB output should be
bypassed to VCC with 0.01µF capacitor.

Under open input conditions, the /D will be biased at a
VCC/2 voltage level and the D input will be pulled to
ground. This condition will force the Q output low to
provide added stability.

The 100EPT is compatible with positive ECL 100K
logic levels.

PIN NAMES

1NC
2

D

LVPECL

3

D

V

4

BB

(Available in 8-pin SOIC and 8-pin MSOP)

LVTTL

8V

CC

Q

7

NC

6

GND

5

Pin Function

Q LVTTL Output
D, /D Differential LVPECL Input Pair
V

CC

V

BB

GND Ground

Positive Supply
Output Reference Voltage

1

Rev.: A Amendment: /1
Issue Date:

July 2000

Micrel

SY100EPT21L

ABSOLUTE MAXIMUM RATINGS

(1)

Symbol Paramter Value Unit

V

CC

V

I

V

O

I

O

T

store

T

A

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.

Power Supply Voltage –0.5 to +3.8 V
PECL Input Voltage 0V to VCC+0.5 V
Voltage Applied to –0.5 to V

Output at HIGH State

CC

V

Current Applied to Twice the mA
Output at LOW State Rated I

OL

Storage Temperature –65 to +150 °C
Operating Temperature –40 to +85 °C

LVTTL DC ELECTRICAL CHARACTERISTICS

VCC = +3.3V ±5%

TRUTH TABLE

D/D Q

LH L

HL H

Open Open L

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

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

I

OS

I

CC

V

OH

V

OL

Output Short Circuit Current –80 –275 –80 –275 –80 — –275 –80 –275 mA V

OUT

= 0V
Power Supply Current — 20 — 20 — 14 20 — 20 mA
Output HIGH Voltage 2.0 — 2.0 — 2.0 — — 2.0 — V IOH = –3.0mA
Output LOW Voltage — 0.5 — 0.5 — — 0.5 — 0.5 V IOL = 24mA

LVPECL DC ELECTRICAL CHARACTERISTICS

VCC = +3.3V ±5%

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

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

I

IH

I

IL

V

IH

V

IL

V

BB

NOTES:

1. These values are for VCC = 3.3V. Level Specifications will vary 1:1 VCC.

Input HIGH Current — 150 — 150 — — 150 — 150 µA
Input LOW Current D 0.5 — 0.5 — 0.5 — — 0.5 — µA

/D –300 — –300 — –300 — — –300 —
Input HIGH Voltage
Input LOW Voltage
Reference Output

(2)

100EPT 2135 2420 2135 2420 2135 — 2420 2135 2420

(2)

100EPT 1490 1825 1490 1825 1490 — 1825 1490 1825

(2)

100EPT 1920 2040 1920 2040 1920 1980 2040 1920 2040

2

Micrel

SY100EPT21L

AC ELECTRICAL CHARACTERISTICS

VCC = +3.3V ±5%

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

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

t

PLH

t

PHL

t

skpp

f

MAX

V

CMR

V

PP

t

r

t

f

NOTES:

1. Part-to-Part Skew considering HIGH-to-HIGH transitions at common V

2. These parameters are guaranteed but not tested.

3. Frequency at which output levels will meet a 0.8V to 2.0V minimum swing.

4. The f

5. 100mV input guarantees full logic at output.

Propagation Delay 1.5 2.5 1.5 2.5 1.5 1.9 2.5 1.5 2.5 ns CL = 20pF

Part-to-Part Skew
Maximum Input Frequency
Common Mode Range 1.2 V
Minimum Peak-to-Peak Input

(1,2)

— 0.5 — 0.5 — — 0.5 — 0.5 ns CL = 20pF

(3,4)

275 — 275 — 275 — — 275 — MHz CL = 20pF

1.2 V

(5)

100 — 100 — 100 — — 100 — mV

CC

1.2 — V

CC

CC

1.2 V

CC

V

Output Rise/Fall Time 0.5 1.0 0.5 1.0 0.5 — 1.0 0.5 1.0 ns CL = 20pF
(1.0V to 2.0V)

level.

CC

value is specified as the minimum guaranteed maximum frequency. Actual operational maximum frequency may be greater.

MAX

PRODUCT ORDERING CODE

Ordering Package Operating VCC Range

Code Type Range (V)

SY100EPT21LZC Z8-1 Commercial +3.3V ±5%
SY100EPT21LZCTR Z8-1 Commercial +3.3V ±5%
SY100EPT21LKC K8-1 Commercial +3.3V ±5%
SY100EPT21LKCTR K8-1 Commercial +3.3V ±5%

3