Fairchild Semiconductor GTLP1B151 Datasheet

June 2001
Revised February 2002

GTLP1B151
1-Bit LVTTL/GTLP Transceiver

with Separate LVTTL Port and Feedback Path

GTLP1B151 1-Bit LVTTL/GTLP Transceiver with Separate LVTTL Port and Feedback Path

General Description

The GTLP1B151 is a 1-bit transceiver that provides
LVTTL-to-GTLP signal level translat ion. Individual LVTTL
and GTLP driver enables are also available. The
GTLP1B151 offers separate LVTTL inputs and outputs,
and can provide a feed back path for con trol and diagnos­tics monitoring.

High-speed backplane operation is a direct result of
GTLP’s reduced output swi ng (
old levels and output edge rate control. The edge rate
control minimizes bus-settling time. GTLP is a Fairchild
Semiconductor derivative of the Gun ning Transistor Logic
(GTL) JEDEC standard JESD8-3.

Fairchild’s GTLP has intern al edge -rate cont rol and i s pro­cess, voltage and tem perature compensated. GTLP ’s I/O
structure is similar to GTL and BTL but offers different out­put levels and receiver threshold. Typical GTLP output volt­age levels are: V

= 0.5V, VOH = 1.5V, and V

OL

<1V), reduced inpu t thres h-

= 1V.

REF

Features

■ Separate LVTTL inputs and outputs

■ A feedback path for control and diagnostics monitoring

■ Bidirectional interface between GTLP and LVTTL logic

levels

■ Designed with edge ra te control circuitry to r educe out­put noise on the GTLP port

■ V

pin provides extern al supply re ference volta ge for

REF

receiver threshold adjustibility

■ Special PVT compensation circui try to provide consis­tent performance over var iatio ns of pr ocess, supply volt­age and temperature

■ TTL compatible driver and control inputs

■ Designed using Fairchild advanced BiCMOS technology

■ Bushold data inputs on A port to e liminate the need for

external pull-up resistors for unused inputs

■ Power up/down and power off high impedance for live
insertion

■ Open drain on GTLP to support wired-or connection

■ Flow through pinout optimizes PCB layout

■ A Port source/sink

■ B Port sink

−24mA / +24mA

+50mA

Ordering Code:

Order Number Package Number Package Description

GTLP1B151M M08A 8-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow

GTLP1B151MX M08A 8-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow

GTLP1B151K8X MAB08A

(Preliminary)

[TUBE]

[TAPE and REEL]
8-Lead US8, JEDEC MO-187, Variation CA 3.1mm Wide

[TAPE and REEL]

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Pin Descriptions Connection Diagrams

Pin Names Description

OEB, OEC

GTLP1B151

, GND, V

V

CC

A A Port LVTTL Input
B B Port GTLP Input/Output
C C Port LVTTL Output

LVTTL Individual Output Enable Controls
(OEC

is Active LOW)

Device Supplies

REF

US8

SOIC

Functional Description

The GTLP1B151 is a 1-bit transceiver that supports GTLP and LVTTL signal levels. Data polarity is non-inverting with sep­arate LVTTL inputs and outputs and there are individual GTLP and LVTTL output enable controls.

Functional Tables

Inputs Outputs

A

OEB OEC

H L L Output L L B Bus Enabled, C Bus Enabled
H L H Output H H B Bus Enabled, C Bus Enabled
H H L Output L Z B Bus Enabled, C Bus Disabled
H H H Output H Z B Bus Enabled, C Bus Disabled
L H L L Z Z B Bus Disabled, C Bus Disabled
L H H H Z Z B Bus Disabled, C Bus Disabled
L L N/A L Z L B Bus Disabled, C Bus Enabled
L L N/A H Z H B Bus Disabled, C Bus Enabled

B

n

B

n

n

C

n

Description

Logic Diagram

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Absolute Maximum Ratings(Note 1) Recommended Operating

Supply Voltage (VCC) −0.5V to +4.6V
DC Input Voltage (V
DC Output Voltage (V

Outputs 3-STATE
Outputs Active (Note 2)

) −0.5V to +4.6V

I

)

O

−0.5V to +4.6V

−0.5V to +4.6V

DC Output Sink Current into

C Port I

OL

48 mA

DC Output Source Current from

C Port I

OH

−48 mA

DC Output Sink Current into

B Port in the LOW State, I

DC Input Diode Current (I

< 0V −50 mA

V

I

DC Output Diode Current (I

V

< 0V −50 mA

O

OL

)

IK

)

OK

ESD Rating

Storage Temperature (T

) −65°C to +150°C

STG

100 mA

>2000V

Conditions

Supply Voltage V
Bus Termination Voltage (V

GTLP 1.47V to 1.53V
V

REF

Input Voltage (V

on A Port and Control Pins 0.0V to V

HIGH Level Output Current (IOH)

C Port

LOW Level Output Current (I

C Port
B Port

Operating Temperature (T

Note 1: Absolute Maximum Ratings are those values beyond which the
safety of the device can not be gu arant eed. The de vice sh ould no t be oper-

ated at these limits. The parametric values defined in the “Electrical Char­acteristics” table are not guarant eed at the ab solute max imum ratin g. The
“Recommended Operating Con ditions” table will define the conditions for
actual device opera tion.

Absolute Maximum Rating must be observed.

Note 2: I

O

CC

)

I

)

TT

)

OL

) −40°C to +85°C

A

DC Electrical Characteristics

Over Recommended Operating Free-Air Temperature Range, V

Symbol Test Conditio ns

V

IH

V

IL

V

REF

V

TT

V

IK

V

OH

V

OL

I

I

I

OFF

I

I (HOLD)

I

OZH

I

OZL

B Port V
Others 2.0
B Port 0.0 V
Others 0.8
B Port 0.7V 1.0 1.3V V
B Port V

C Port VCC = Min to Max (Note 4) IOH = −100 µAV

C Port VCC = Min to Max (Note 4) IOL = 100 µA0.2

B Port VCC = 3.15V IOL = 40 mA 0.4

Control Pins VCC = 3.45V VI = 3.45V 5

A Port VCC = 3.45V VI = 3.45V 10

B Port VCC = 3.45V VI = 3.45 5

A or C Ports, VCC = 0V
Control Pins
B Port VCC = 0V
A Port VCC = 3.15V VI = 0.8V 75

C Port VCC = 3.45V VO = 3.45V 10
B Port VO = 3.45V 5
C Port VCC = 3.45V VO = 0V −10
B Port VO = 0.0V −5

VCC = 3.15V II = −18 mA −1.2 V

= 3.15V IOH = −8 mA 2.4

CC

= 3.15V IOL = 24mA 0.5

V

CC

= 1.0V (unless otherwise noted).

REF

= -24mA 2.2

I

OH

IOL = 50 mA 0.55

VI = 0V −5

VI = 0V −10

VI = 0 −5

or VO = 0 to 3.45V 30 µA

I

or VO = 0 to 3.45V 30 µA

I

VI = 2.0V −75

Min Typ Max

+ 0.05 V

REF

+ 50 mV 1.5 V

REF

–0.2

CC

(Note 3)

REF

3.15V to 3.45V

0.98V to 1.02V

−24 mA

+24 mA
+50 mA

TT

− 0.05

CC

GTLP1B151

CC

Units

V

V

V

VV

VVCC = 3.15V IOL = 8 mA 0.4

V

µA

µA

µA

µA

µA

µA

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