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GTLP1B151 1-Bit LVTTL/GTLP Transceiver with Separate LVTTL Port and Feedback Path
June 2001
Revised February 2002
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 translation. Individual LVTTL
and GTLP driver enables are also available. The
GTLP1B151 offers separate LVTTL inputs and outputs,
and can provide a feedback path for control and diagnos-
tics monitoring.
High-speed backplane operation is a direct result of
GTLP’s reduced output swing (
<
1V), reduced input thresh-
old levels and output edge rate control. The edge rate
control minimizes bus-settling time. GTLP is a Fairchild
Semiconductor derivative of the Gunning 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
Separate LVTTL inputs and outputs
s
A feedback path for control and diagnostics monitoring
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
GTLP1B151M
GTLP1B151MX
GTLP1B151K8X
Package Number
M08A
M08A
MAB08A
(Preliminary)
Package Description
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]
© 2002 Fairchild Semiconductor Corporation
DS500484
www.fairchildsemi.com
GTLP1B151
Pin Descriptions
Pin Names
OEB, OEC
Description
LVTTL Individual Output Enable Controls
(OEC is Active LOW)
Connection Diagrams
US8
V
CC
, GND, V
REF
Device Supplies
A
B
C
A Port LVTTL Input
B Port GTLP Input/Output
C Port LVTTL Output
SOIC
Functional Description
The GTLP1B151 is a 1-bit transceiver that supports GTLP and LVTTL signal levels. Data polarity is non-inverting with sep-
arate LVTTL inputs and outputs and there are individual GTLP and LVTTL output enable controls.
Functional Tables
Inputs
OEB
H
H
H
H
L
L
L
L
OEC
L
L
H
H
H
H
L
L
A
n
L
H
L
H
L
H
N/A
N/A
B
n
Output
Output
Output
Output
L
H
L
H
B
n
L
H
L
H
Z
Z
Z
Z
Outputs
C
n
L
H
Z
Z
Z
Z
L
H
Description
B Bus Enabled, C Bus Enabled
B Bus Enabled, C Bus Enabled
B Bus Enabled, C Bus Disabled
B Bus Enabled, C Bus Disabled
B Bus Disabled, C Bus Disabled
B Bus Disabled, C Bus Disabled
B Bus Disabled, C Bus Enabled
B Bus Disabled, C Bus Enabled
Logic Diagram
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2
GTLP1B151
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
C Port I
OL
DC Output Source Current from
C 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
)
C Port
LOW Level Output Current (I
OL
)
C 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
C 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
C 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
V
CC
=
3.15V
V
CC
=
3.45V
V
CC
=
3.45V
V
CC
=
3.45V
I
I
= −18
mA
I
OH
= −100 µA
I
OH
= −8
mA
I
OH
= -24mA
I
OL
=
100
µA
I
OL
=
8 mA
I
OL
=
24mA
I
OL
=
40 mA
I
OL
=
50 mA
V
I
=
3.45V
V
I
=
0V
V
I
=
3.45V
V
I
=
0V
V
I
=
3.45
V
I
=
0
A or C Ports, V
CC
=
0
Control Pins
B Port
I
I (HOLD)
I
OZH
I
OZL
A Port
C Port
B Port
C Port
B Port
V
CC
=
3.45V
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
V
O
=
0V
V
O
=
0.0V
75
−75
10
5
−10
−5
30
µA
µA
µA
µA
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
3
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GTLP1B151
DC Electrical Characteristics
Symbol
I
PU/PD
I
CC
All Ports
A or B Ports
or C Port
∆I
CC
(Note 5)
C
i
C
O
C
I/O
A Port and
Control Pins
Control Pins
and A Port
C Port
B Port
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,
(Continued)
Min
Typ
(Note 3)
30
11
11
11
2
3
5
5.5
mA
mA
Max
Test Conditions
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
A or Control Inputs at V
CC
or GND
−0.6V
pF
pF
pF
Note 3:
All typical values are at V
CC
=
3.3V and T
A
=
25°C.
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 C Port.
Symbol
t
PLH
t
PHL
t
PLH
t
PHL
t
PLH
t
PHL
t
RISE
t
FALL
t
RISE
t
FALL
t
PZH
, t
PZL
t
PHZ
, t
PLZ
t
PLH
t
PHL
From
(Input)
A
B
A
To
(Output)
B
C
C
1.2
0.8
1.4
1.6
1.6
2.0
Min
Typ
(Note 6)
3.2
2.3
2.8
2.9
6.0
5.1
1.4
2.0
2.8
2.5
1.2
1.4
1.7
0.5
2.7
2.8
3.5
2.2
5.3
4.9
5.9
4.7
7.3
4.5
4.4
5.0
8.1
7.5
Max
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
Transition Time, B Outputs (20% to 80%)
Transition Time, B Outputs (80% to 20%)
Transition Time, C Outputs (10% to 90%)
Transition Time, C Outputs (90% to 10%)
OEC
OEB
C
B
Note 6:
All typical values are at V
CC
=
3.3V, and T
A
=
25°C.
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