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GTLP2T152 2-Bit LVTTL/GTLP Transceiver
June 2001
Revised February 2002
GTLP2T152
2-Bit LVTTL/GTLP Transceiver
General Description
The GTLP2T152 is a 2-bit transceiver that provides LVTTL-
to-GTLP signal level translation. Data directional control is
handled with a transmit/receive pin. High-speed backplane
operation is a direct result of GTLP’s reduced output swing
(
<
1V), reduced input threshold 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 internal edge-rate control and is pro-
cess, voltage and temperature compensated. GTLP’s I/O
structure is similar to GTL and BTL but offers different out-
put levels and receiver threshold. Typical GTLP output volt-
age levels are: V
OL
=
0.5V, V
OH
=
1.5V, and V
REF
=
1V.
Features
s
Bidirectional interface between GTLP and LVTTL logic
levels
s
Designed with edge rate control circuitry to reduce out-
put noise on the GTLP port
s
V
REF
pin provides external supply reference voltage for
receiver threshold adjustibility
s
Special PVT compensation circuitry to provide consis-
tent performance over variations of process, supply volt-
age and temperature
s
TTL compatible driver and control inputs
s
Designed using Fairchild advanced BiCMOS technology
s
Bushold data inputs on A port to eliminate the need for
external pull-up resistors for unused inputs
s
Power up/down and power off high impedance for live
insertion
s
Open drain on GTLP to support wired-or connection
s
Flow through pinout optimizes PCB layout
s
A Port source/sink
−
24mA/
+
24mA
s
B Port sink
+
50mA
Ordering Code:
Order Number
GTLP2T152M
GTLP2T152MX
GTLP2T152K8X
Package Number Package Description
M08A
M08A
MAB08A
(Preliminary)
8-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow
[TUBE]
8-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow
[TAPE and REEL]
8-Lead US8, JEDEC MO-187, Variation CA 3.1mm Wide
[TAPE and REEL]
Pin Descriptions
Pin Names
T/R
Description
LVTTL Direction Control
(Receive Direction is Active LOW)
Connection Diagrams
US8
V
CC
, GND, V
REF
Device Supplies
A
n
B
n
A Port LVTTL Input/Output
B Port GTLP Input/Output
SOIC
© 2002 Fairchild Semiconductor Corporation
DS500486
www.fairchildsemi.com
GTLP2T152
Functional Description
The GTLP2T152 is a 2-bit transceiver that supports GTLP and LVTTL signal levels. Data polarity is non-inverting and the
the GTLP/LVTTL outputs are controlled by the T/R pin.
Functional Table
Inputs
Outputs
T/R
H
L
Bus A
n
Data to Bus B
n
Bus B
n
Data to Bus A
n
B
n
Output Data Enabled
A
n
Output Data Enabled
Description
Logic Diagram
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2
GTLP2T152
Absolute Maximum Ratings
(Note 1)
Supply Voltage (V
CC
)
DC Input Voltage (V
I
)
DC Output Voltage (V
O
)
Outputs 3-STATE
Outputs Active (Note 2)
DC Output Sink Current into
A Port I
OL
DC Output Source Current from
A Port I
OH
DC Output Sink Current into
B Port in the LOW State, I
OL
DC Input Diode Current (I
IK
)
V
I
<
0V
DC Output Diode Current (I
OK
)
V
O
<
0V
ESD Rating
Storage Temperature (T
STG
)
100 mA
48 mA
−
0.5V to
+
4.6V
−
0.5V to
+
4.6V
−
0.5V to
+
4.6V
−
0.5V to
+
4.6V
Recommended Operating
Conditions
Supply Voltage V
CC
Bus Termination Voltage (V
TT
)
GTLP
V
REF
Input Voltage (V
I
)
on A Port and Control Pins
HIGH Level Output Current (I
OH
)
A Port
LOW Level Output Current (I
OL
)
A Port
B Port
Operating Temperature (T
A
)
0.0V to V
CC
1.47V to 1.53V
0.98V to 1.02V
3.15V to 3.45V
−
48 mA
−
24 mA
+
24 mA
+
50 mA
−
40
°
C to
+
85
°
C
−
50 mA
−
50 mA
>
2000V
−
65
°
C to
+
150
°
C
Note 1:
Absolute Maximum Ratings are those values beyond which the
safety of the device cannot be guaranteed. The device should not be oper-
ated at these limits. The parametric values defined in the “Electrical Char-
acteristics” table are not guaranteed at the absolute maximum rating. The
“Recommended Operating Conditions” table will define the conditions for
actual device operation.
Note 2:
I
O
Absolute Maximum Rating must be observed.
DC Electrical Characteristics
Over Recommended Operating Free-Air Temperature Range, V
REF
=
1.0V (unless otherwise noted).
Symbol
V
IH
V
IL
V
REF
V
TT
V
IK
V
OH
A Port
B Port
Others
B Port
Others
B Port
B Port
V
CC
=
3.15V
V
CC
=
Min to Max (Note 4)
V
CC
=
3.15V
V
OL
A Port
V
CC
=
Min to Max (Note 4)
V
CC
=
3.15V
V
CC
=
3.15V
B Port
I
I
Control Pins
A Port
B Port
I
OFF
A Port,
Control Pins
B Port
I
I (HOLD)
I
OZH
A Port
A Port
B Port
V
CC
=
0
V
CC
=
3.15V
V
CC
=
3.45V
V
I
or V
O
=
0 to 3.45V
V
I
=
0.8V
V
I
=
2.0V
V
O
=
3.45V
V
O
=
3.45V
75
−75
10
5
30
µA
V
CC
=
3.15V
V
CC
=
3.45V
V
CC
=
3.45V
V
CC
=
3.45V
V
CC
=
0
I
I
= −18
mA
I
OH
= −100 µA
I
OH
= −8
mA
I
OH
= -24 mA
I
OL
=
100
µA
I
OL
=
8 mA
I
OL
=
24 mA
I
OL
=
40 mA
I
OL
=
50 mA
V
I
=
3.45V
V
I
=
0V
V
I
=
3.45V
V
I
=
0V
V
I
=
3.45V
V
I
=
0
V
I
or V
O
=
0 to 3.45V
V
CC
- 0.2
2.4
2.2
0.2
0.4
0.5
0.4
0.55
5
−5
10
−10
5
−5
30
V
µA
µA
µA
µA
V
V
0.7V
V
REF
+
50 mV
1.0
1.5
Test Conditions
Min
V
REF
+
0.05
2.0
0.0
V
REF
−
0.05
0.8
1.3V
V
CC
−1.2
Typ
(Note 3)
V
TT
Max
Units
V
V
V
V
V
µA
µA
3
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GTLP2T152
DC Electrical Characteristics
Symbol
I
OZL
I
PU/PD
I
CC
A Port
B Port
All Ports
A Port
or B Port
∆I
CC
(Note 5)
C
i
C
I/O
A Port and
Control Pins
Control Pins
A Port
B Port
Note 3:
All typical values are at V
CC
=
3.3V and T
A
=
25°C.
(Continued)
Min
Typ
(Note 3)
−10
−5
30
11
11
11
2
3
5
5.5
mA
pF
pF
pF
mA
Max
Test Conditions
V
CC
=
3.45V
V
CC
=
0 to 1.5V
V
CC
=
3.45V
I
O
=
0
V
I
=
V
CC
/V
TT
or GND
V
CC
=
3.45V,
V
O
=
0V
V
O
=
0V
V
I
=
0 to 3.45V
Outputs HIGH
Outputs LOW
Outputs Disabled
One Input at V
CC
V
I
=
V
CC
or 0
V
I
=
V
CC
or 0
V
I
=
V
TT
or 0
Units
µA
µA
A or Control Inputs at V
CC
or GND
−0.6V
Note 4:
For conditions shown as Min, use the appropriate value specified under recommended operating conditions.
Note 5:
This is the increase in supply current for each input that is at the specified TTL voltage level rather than V
CC
or GND.
Note:
GTLP V
REF
and V
TT
are specified to 2% tolerance since signal integrity and noise margin can be significantly degraded if these supplies are noisy. In
addition, V
TT
and R
TERM
can be adjusted beyond the recommended operating to accommodate backplane impedances other than 50Ω, but must remain
within the boundaries of the DC Absolute Maximum Ratings. Similarly, V
REF
can be adjusted to optimize noise margin.
AC Electrical Characteristics
Over recommended range of supply voltage and operating free-air temperature, V
REF
=
1.0V (unless otherwise noted).
C
L
=
30 pF for B Port and C
L
=
50 pF for A Port.
Symbol
t
PLH
t
PHL
t
PLH
t
PHL
t
RISE
t
FALL
t
RISE
t
FALL
From
(Input)
A
B
To
(Output)
B
A
1.2
0.8
1.4
1.6
Min
Typ
(Note 6)
2.9
2.0
2.5
2.7
1.5
1.8
2.5
2.2
7.3
4.5
4.4
5.0
Max
Unit
ns
ns
ns
ns
ns
ns
Transition Time, B Outputs (20% to 80%)
Transition Time, B Outputs (80% to 20%)
Transition Time, A Outputs (10% to 90%)
Transition Time, A Outputs (90% to 10%)
Note 6:
All typical values are at V
CC
=
3.3V, and T
A
=
25°C.
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