IDT74GTLP306
8-BIT LVTTL/GTLP BUS TRANSCEIVER
INDUSTRIAL TEMPERATURE RANGE
8-BIT LVTTL/GTLP
BUS TRANSCEIVER
IDT74GTLP306
FEATURES:
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Bidirectional interface between GTLP and LVTTL logic levels
Edge Rate Control Circuit reduces output noise
V
REF
pin provides reference voltage for receiver threshold
CMOS technology for low power dissipation
Special PVT Compensation circuitry to provide consistent perfor-
mance over variations of process, supply voltage, and temperature
5V tolerant inputs on LVTTL ports
Bus-Hold to eliminate the need for external pull-up resistors for
unused inputs to A-Port
Power up/down and power-off high-impedance for live insertion
TTL-compatible Driver and Control inputs
High Output source/sink ±24mA on A-Port pins
Flow-through architecture optimizes system layout
Open drain on GTLP to support wired OR connection
ESD performance of >2000V
Available in TSSOP package
DESCRIPTION:
The GTLP306 is an 8-bit bus transceiver. It provides signal level
translation, from LVTTL to GTLP, for applications requiring a high-speed
interface between cards operating at LVTTL logic levels and back-planes
operating at GTLP logic levels. GTLP provides reduced output swing
(<1V), reduced input threshold levels, and output edge-rate control to
minimize signal setting times. The GTLP306 is a derivative of the Gunning
Transceiver Logic (GTL) JEDEC standard JESD8-3 and incorporates
internal edge-rate control, which is process, voltage, and temperature
(PVT) compensated.
The GTLP306 combines a transceiver function with an LVTTL to GTLP
translation. Data polarity is non-inverting, and the data flow direction is
controlled by the T/R pin. The outputs are enabled to allow data through
the device when
OE
is low. Otherwise, both A and B are placed in a high-
impedance state.
GTLP output low voltage is less than 0.5V. The output high is 1.5V, and
the receiver threshold is 1V.
FUNCTIONAL BLOCK DIAGRAM
T/R
OE
A0 (LVTTL I/O)
B0 (GTLP I/O)
TO SEVEN OTHER CHANNELS
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
INDUSTRIAL TEMPERATURE RANGE
1
c
2002 Integrated Device Technology, Inc.
MAY 2002
DSC-5978/9
IDT74GTLP306
8-BIT LVTTL/GTLP BUS TRANSCEIVER
INDUSTRIAL TEMPERATURE RANGE
PIN CONFIGURATION
OE
V
CC
A
0
A
1
A
2
A
3
GND
A
4
A
5
A
6
A
7
GND
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
T/R
V
REF
B
0
B
1
B
2
B
3
GND
B
4
B
5
B
6
B
7
GND
ABSOLUTE MAXIMUM RATINGS
(1,2)
Symbol
V
CC
V
I
V
O
V
O
I
OL
I
OH
I
OL
I
IK
I
OK
I
OK
T
STG
Rating
Supply Voltage
DC Input Voltage
DC Output Voltage, 3-State
DC Output Voltage, Active
DC Output Sink Current into A-port
DC Output Source Current from A-port
DC Output Sink Current into B-port
(in the LOW state)
DC Input Diode Current V
I
< 0V
DC Output Diode Current V
O
< 0V
DC Output Diode Current V
O
> V
CC
Storage Temperature
–50
–50
+50
–65 to +150
mA
mA
mA
°C
Max.
–0.5 to +7
–0.5 to +7
–0.5 to +7
–0.5 to +7
48
–48
100
Unit
V
V
V
V
mA
mA
mA
NOTES:
1. Stresses greater than those listed under ABSOLUTE MAXIMUM RATINGS may cause
permanent damage to the device. This is a stress rating only and functional operation
of the device at these or any other conditions above those indicated in the operational
sections of this specification is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect reliability.
2. Unused inputs without Bus-Hold must be held HIGH or LOW.
TSSOP
TOP VIEW
CAPACITANCE
(T
A
= +25°C, f = 1.0MH
Z
)
Symbol
C
IN
C
I
/
O
Parameter
(1)
Control Pins
A-Port
B-Port
Conditions
V
I
= V
CCQ
or 0
V
I
= V
CCQ
or 0
V
I
= V
CCQ
or 0
Typ.
(2)
5
7
9
Max.
—
—
—
Unit
pF
pF
pF
PIN DESCRIPTION
Pin Names
OE
T/R
V
REF
A
0
- A
7
B
0
- B
7
Description
(1)
Output Enable (Active LOW)
Transmit/Receive Input
GTLP Input Reference Voltage
Side A Inputs or 3-State Outputs
Side B Inputs or 3-State Outputs
C
I
/
O
NOTES:
1. As applicable to the device type.
2. All typical values are at V
CC
= 3.3V.
NOTE:
1. A-Port pins have Bus-Hold. All other pins are standard input, output, or I/O.
RECOMMENDED OPERATING
CONDITIONS
(1)
Symbol
V
CC
V
TT
Supply Voltage
Bus Termination Voltage
Input Voltage on A-Port and Control Pins
HIGH Level Output Current (A-Port)
LOW Level Output Current (A-Port)
LOW Level Output Current (B-Port)
Operating Temperature
Rating
Recommended
3.15 to 3.45
1.35 to 1.65
0 to 5.5
-24
+24
50
–40 to +85
Unit
V
V
V
mA
mA
mA
°C
FUNCTION TABLE
(1)
Inputs
OE
H
L
L
T/R
X
L
H
Output
High Z on Bus A and Bus B
Bus B Data to Bus A
Bus A Data to Bus B
V
I
I
OH
I
OL
I
OL
T
A
NOTE:
1. Unused inputs without Bus-Hold must be held HIGH or LOW.
NOTE:
1. H = HIGH Voltage Level
X = Don’t Care
L = LOW Voltage Level
2
IDT74GTLP306
8-BIT LVTTL/GTLP BUS TRANSCEIVER
INDUSTRIAL TEMPERATURE RANGE
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified:
Industrial: T
A
= –40°C to +85°C, V
REF
= 1V, V
CC
= 3.3V ± 5%
Symbol
V
IH
V
IL
V
REF
V
IK
V
OH
A-Port
V
OL
B-Port
Control Pins
A-Port
I
I
B-Port
I
OFF
I
I
(HOLD)
I
OZH
I
OZL
A-Port
A-Port
A-Port
B-Port
A-Port
B-Port
V
CC
= 3.45V
I
CC
(V
CC
)
∆I
CC
(3)
Parameter
B-Port
All Other ports
B-Port
All Other ports
GTLP
GTL
—
A-Port
V
CC
= 3.15V
Test Conditions
—
—
—
—
—
—
I
I
= –18mA
I
OH
= –100µA
I
OH
= –12mA
I
OH
= –24mA
V
CC
= Min to Max
V
CC
= 3.15V
V
CC
= 3.15V
V
CC
= 3.45V
V
CC
= 3.45V
V
CC
= 3.45V
V
CC
= 0
V
CC
= 3.15V
V
CC
= 3.45V
V
CC
= 3.45V
(2)
Min.
V
REF
+ 0.05
2
0
—
—
—
—
V
CC
–0.2
2.4
2
—
—
—
—
—
—
—
—
—
—
75
–20
—
—
—
—
—
—
—
—
Typ.
(1)
—
—
—
—
1
0.8
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
7
8
8
0
Max.
V
TT
—
V
REF
– 0.05
0.8
—
—
–1.2
—
—
—
0.2
0.5
0.4
0.55
±5
20
–20
5
–5
100
—
—
20
5
–20
–5
18
20
20
1
Unit
V
V
V
V
V
V
CC
= Min to Max
(2)
V
CC
= 3.15V
I
OL
= 100µA
I
OL
= 24mA
I
OL
= 40mA
I
OL
= 50mA
V
I
= 5.5V or 0V
V
I
= 5.5V
V
I
= 0
V
I
= V
TT
V
I
= 0
V
I
or V
O
= 0 to 4.5V
V
I
= 0.8V
V
I
= 2V
V
O
= 3.45 V
V
O
= 1.5V
V
O
= 0
V
O
= 0.55V
Outputs HIGH
Outputs LOW
Outputs Disabled
One Input at V
CC
- 0.6V
V
µA
µA
µA
µA
µA
A or B Ports
A-Port and Control Pins
I
O
= 0
V
I
= V
CC
or GND
V
CC
= 3.45V
A or Control Inputs at
V
CC
or GND
mA
mA
NOTES:
1. All typical values are at V
CC
= 3.3V and T
A
= 25°C.
2. For conditions shown as Max. or Min., use appropriate value specified under Recommended Operating Conditions.
3.
∆I
CC
is the increase in supply current for each input that is at the specified LVTTL voltage level rather than V
CC
or GND.
3
IDT74GTLP306
8-BIT LVTTL/GTLP BUS TRANSCEIVER
INDUSTRIAL TEMPERATURE RANGE
SWITCHING CHARACTERISTICS OVER OPERATING RANGE
(1,2)
Symbol
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
NOTES:
1. See Test Circuits and Waveforms. T
A
= –40°C to +85°C.
2. Unless otherwise noted, V
REF
= 1V.
3. Typical values are at V
CC
= 3.3V and T
A
= 25°C.
Parameter
Ax to Bx
Bx to Ax
Transition Time, B outputs (20% to 80%)
Transition Time, B outputs (20% to 80%)
Transition Time, A outputs (10% to 90%)
Transition Time, A outputs (10% to 90%)
OE
to Ax
OE
to Bx
Min.
1
1
1
1
—
—
—
—
1
1
1
1
Typ.
(3)
4
5.1
5.8
4.9
2.6
2.6
2.5
2.5
4.5
4.9
5.4
6
Max.
7.5
7.5
8.3
8.3
—
—
—
—
9.5
9.5
9.5
9.5
Unit
ns
ns
ns
ns
ns
ns
ns
ns
4
IDT74GTLP306
8-BIT LVTTL/GTLP BUS TRANSCEIVER
INDUSTRIAL TEMPERATURE RANGE
TEST CIRCUITS AND WAVEFORMS
6V
Open
GND
500Ω
FROM
OUTPUT
UNDER
TEST
25Ω
1.5V (GTLP)
1.2V (GTL)
FROM
OUTPUT
UNDER
TEST
C
L
= 50pF
500Ω
S
30pF
(1)
NOTE:
1. C
L
includes probes and jig capacitance.
NOTE:
1. C
L
includes probes and jig capacitance. For B-Port outputs, C
L
= 30pF is used for
worst case edge rate.
Test Circuit for A Outputs
(1)
Test Circuit for B Outputs
(1)
SWITCH POSITION
Test
t
PLH
/ t
PHL
t
PHZ
/ t
PZH
t
PLZ
/ t
PZL
Switch
Open
GND
6V
NOTE:
1. 1.5V for B-Port GTLP.
1.2V for B-Port GTL.
t
W
3V
(1)
INPUT
Vm V
Vm V
0V
Voltage Waveforms Pulse Duration
(Vm = V
CC
/2 for A-Port, 1V for GTLP B-Port, and 0.8V for GTL
B-Port)
NOTE:
All input pulses have the following characteristics: frequency = 10 MHz, t
R
= t
F
= 2 ns, Z
O
= 50Ω. The outputs are measured one at a time with one transition per measurement.
5
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
