www.ti.com
SN74GTL1655
16-BIT LVTTL-TO-GTL/GTL+ UNIVERSAL BUS TRANSCEIVER
WITH LIVE INSERTION
FEATURES
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Member of the Texas Instruments Widebus™
Family
UBT™ Transceiver Combines D-Type Latches
and D-Type Flip-Flops for Operation in
Transparent, Latched, or Clocked Modes
OEC™ Circuitry Improves Signal Integrity and
Reduces Electromagnetic Interference
Translates Between GTL/GTL+ Signal Level
and LVTTL Logic Levels
High-Drive (100 mA), Low-Output-Impedance
(12 Ω) Bus Transceiver (B Port)
Edge-Rate-Control Input Configures the
B-Port Output Rise and Fall Times
Ioff, Power-Up 3-State, and BIAS VCC Support
Live Insertion
Bus Hold on Data Inputs Eliminates the Need
for External Pullup/Pulldown Resistors on A
Port
Distributed VCC and GND Pins Minimize
High-Speed Switching Noise
DESCRIPTION/ORDERING INFORMATION
The SN74GTL1655 is a high-drive (100 mA),
low-output-impedance
(12 Ω)
16-bit
UBT™
transceiver that provides LVTTL-to-GTL/GTL+ and
GTL/GTL+-to-LVTTL signal-level translation. This
device is partitioned as two 8-bit transceivers and
combines D-type flip-flops and D-type latches to allow
for transparent, latched, and clocked modes of data
transfer similar to the '16501 function. This device
provides an interface between cards operating at
LVTTL logic levels and a backplane operating at
GTL/GTL+ signal levels. Higher-speed operation is a
direct result of the reduced output swing ( VCC.
The package thermal impedance is calculated in accordance with JESD 51-7.
Recommended Operating Conditions (1) (2) (3) (4)
BIAS VCC
Supply voltage
VTT
Termination voltage
VREF
Reference voltage
VI
Input voltage
MIN
NOM
MAX
3
3.3
3.6
GTL
1.14
1.2
1.26
GTL+
1.35
1.5
1.65
GTL
0.74
0.8
0.87
GTL+
0.87
1
1.1
B port
0
VTT
Except B port
0
VCC
B port
VIH
High-level input voltage
VERC
Except B port and ERC
Low-level input voltage
VCC – 0.6
Input clamp current
IOH
High-level output current
VERC
VCC
GND
0.6
V
mA
A port
–24
mA
A port
24
B port
100
Power-up ramp rate
200
TA
Operating free-air temperature
–40
6
V
–18
∆t/∆VCC
(3)
(4)
V
0.8
Low-level output current
(2)
V
VREF – 50 mV
IOL
(1)
V
2
Except B port and ERC
IIK
V
VREF + 50 mV
B port
VIL
UNIT
mA
µs/V
85
°C
All unused inputs of the device must be held at VCC or GND to ensure proper device operation. Refer to the TI application report,
Implications of Slow or Floating CMOS Inputs, literature number SCBA004.
Normal connection sequence is GND first, BIAS VCC = 3.3 V second, and VCC = 3.3 V, I/O, control inputs, VTT and VREF (any order) last.
However, if the B-port I/O precharge is not required, the acceptable connection sequence is GND first and
VCC = 3.3 V, BIAS VCC = 3.3 V, I/O, control inputs, VTT and VREF (any order) last. When VCC is connected, the BIAS VCC circuitry is
disabled.
VTT and RTT can be adjusted to accommodate backplane impedances if the dc recommended IOL ratings are not exceeded.
VREF can be adjusted to optimize noise margins, but normally is two-thirds VTT.
SN74GTL1655
16-BIT LVTTL-TO-GTL/GTL+ UNIVERSAL BUS TRANSCEIVER
WITH LIVE INSERTION
www.ti.com
SCBS696I – JULY 1997 – REVISED APRIL 2005
Electrical Characteristics
over recommended operating free-air temperature range, VREF = 1 V and VTT = 1.5 V (unless otherwise noted)
PARAMETER
VIK
VOH
A port
VCC = 3 V,
II = –18 mA
VCC = 3 V to 3.6 V,
IOH = –100 µA
VCC – 0.2
IOH = –12 mA
2.4
IOH = –24 mA
2.2
VCC = 3 V
A port
VCC = 3 V
VOL
B port
VCC = 3 V
Control inputs
VCC = 3.6 V
B port
Ioff
VCC = 0,
II(hold)
VCC = 3.6
V
IOL = 12 mA
0.4
IOL = 24 mA
0.55
IOL = 40 mA
0.2
IOL = 80 mA
0.4
IOL = 100 mA
0.5
VI = VCC or GND
±10
VI = VTT or GND
±10
±100
VI = 0.8 V
VI = 2 V
V (2),
UNIT
–1.2
0.2
VI or VO = 0 to 3.6 V
VCC = 3 V
A port
MAX
V
IOL = 100 µA
VCC = 3 V to 3.6 V,
II
MIN TYP (1)
TEST CONDITIONS
V
µA
µA
75
µA
–75
VI = 0 to VCC
±500
IOZH
B port
VCC = 3.6 V,
VO = 1.5 V
10
µA
IOZL
B port
VCC = 3.6 V,
VO = 0.4 V
–10
µA
(3)
A port
VCC = 3.6 V,
VO = VCC or GND
±10
µA
IOZPU
A port
VCC = 0 to 3.6 V, VO = 0.5 V to 3 V, OE = low
±50
µA
IOZPD
A port
VCC = 3.6 V to 0, VO = 0.5 V to 3 V, OE = low
±50
µA
IOZ
ICC
VCC = 3.6 V, IO = 0,
VI = VCC or GND
A or B port
Outputs high
80
Outputs low
80
Outputs disabled
80
∆ICC (4)
Except B port
VCC = 3.6 V, A-port or control inputs at VCC or GND,
One input at VCC – 0.6 V
Ci
Control inputs
VI = VCC or 0
Cio
(1)
(2)
(3)
(4)
A port
VO = VCC or 0
B port
mA
1
mA
3
5
pF
5
6
6
8
pF
All typical values are at VCC = 3.3 V, TA = 25°C.
This is the bus-hold maximum dynamic current. It is the minimum overdrive current required to switch the input from one state to
another.
For I/O ports, the parameter IOZ includes the input leakage current.
This is the increase in supply current for each input that is at the specified TTL voltage level rather than VCC or GND.
Live-Insertion Specifications
over recommended operating free-air temperature range
PARAMETER
ICC (BIAS VCC)
VO
IO
B port
B port
TEST CONDITIONS
VCC = 0 to 3 V
VCC = 3 V to 3.6 V
VO (B port) = 0 to 1.2 V,
MIN
VI (BIAS VCC) = 3 V to 3.6 V
1
MAX
mA
10
µA
1.2
V
µA
VCC = 0,
VI (BIAS VCC) = 3.3 V
VCC = 0,
VO (B port) = 0.4 V,
VCC = 0 to 3.6 V,
OE = 3.3 V
100
VCC = 0 to 1.5 V,
OE = 0 to 3.3 V
100
VI (BIAS VCC) = 3 V to 3.6 V
UNIT
5
–1
7
SN74GTL1655
16-BIT LVTTL-TO-GTL/GTL+ UNIVERSAL BUS TRANSCEIVER
WITH LIVE INSERTION
www.ti.com
SCBS696I – JULY 1997 – REVISED APRIL 2005
Timing Requirements
over recommended ranges of supply voltage and operating free-air temperature,
VTT = 1.2 V, VREF = 0.8 V, and VERC = VCC or GND for GTL (unless otherwise noted)
MIN
fclock
Clock frequency
tw
Pulse duration
tsu
Setup time
LE high
3
CLK high or low
3
Data before CLK↑
th
Data before LE↓
Data after LE↓
UNIT
160
MHz
ns
2.7
CLK high
2.8
CLK low
2.6
Data after CLK↑
Hold time
MAX
ns
0.4
CLK high or low
ns
0.9
A-to-B Switching Characteristics
over recommended ranges of supply voltage and operating free-air temperature,
VTT = 1.2 V, VREF = 0.8 V, and VERC = VCC or GND for GTL (see Figure 1)
PARAMETER
MAX
3.1
5.2
2.6
6.2
3.4
5.5
2.4
5.8
3.5
5.8
2.6
6.4
3.3
5.4
2.7
5.9
2.3
4.3
1.9
4.3
2.7
4.8
1.8
4.3
2.8
4.9
2
4.8
2.5
4.5
2
4.2
tPLH
tPHL
ten
tdis
tPLH
tPHL
tPLH
tPHL
tPLH
tPHL
ten
tdis
8
TYP
160
tPHL
(1)
(2)
MIN
fmax
tPLH
tf
TO
(OUTPUT)
tPLH
tPHL
tr
FROM
(INPUT)
VERC = GND
VERC = VCC
VERC = GND
VERC = VCC
A
VERC = VCC
B
CLK
VERC = VCC
B
LEAB
VERC = VCC
B
OEAB or OE
VERC = VCC
B
A
VERC = GND
B
CLK
VERC = GND
B
LEAB
VERC = GND
B
OEAB or OE
VERC = GND
B
Transition time, B outputs (0.6 V to 1 V)
Transition time, B outputs (1 V to 0.6 V)
UNIT
MHz
0.6
ns
ns
ns
ns
ns
ns
ns
ns
ns
1.2
1.1
ns
1.7
tsk(o) (1)
Skew between drivers in the same package
switching in the same direction
1
ns
tsk(o) (2)
Skew between drivers
switching in any direction in the same package
1
ns
Skew values are applicable for through mode only.
Skew values are applicable for CLK mode only, with all outputs switching simultaneously.
SN74GTL1655
16-BIT LVTTL-TO-GTL/GTL+ UNIVERSAL BUS TRANSCEIVER
WITH LIVE INSERTION
www.ti.com
SCBS696I – JULY 1997 – REVISED APRIL 2005
B-to-A Switching Characteristics
over recommended ranges of supply voltage and operating free-air temperature,
VTT = 1.2 V and VREF = 0.8 V for GTL (see Figure 1)
PARAMETER
TO
(OUTPUT)
MIN
MAX
fmax
160
tPLH
1.8
4.7
2.3
4.6
tPHL
tPLH
tPHL
tPLH
tPHL
ten
tdis
(1)
(2)
FROM
(INPUT)
B
A
CLK
A
LEBA
A
OEBA or OE
A
UNIT
MHz
1.6
4
1.5
3.4
1.7
4
1.4
3.5
1.2
4.2
1.2
6.1
ns
ns
ns
ns
tsk(o) (1)
Skew between drivers in the same package
switching in the same direction
1
ns
tsk(o) (2)
Skew between drivers
switching in any direction in the same package
1
ns
Skew values are applicable for through mode only.
Skew values are applicable for CLK mode only, with all outputs switching simultaneously.
9
SN74GTL1655
16-BIT LVTTL-TO-GTL/GTL+ UNIVERSAL BUS TRANSCEIVER
WITH LIVE INSERTION
www.ti.com
SCBS696I – JULY 1997 – REVISED APRIL 2005
Timing Requirements
over recommended ranges of supply voltage and operating free-air temperature,
VTT = 1.5 V, VREF = 1 V, and VERC = VCC or GND for GTL+ (unless otherwise noted)
MIN
fclock
Clock frequency
tw
Pulse duration
tsu
Setup time
LE high
3
CLK high or low
3
Data before CLK↑
th
Data before LE↓
Data after LE↓
UNIT
160
MHz
ns
2.7
CLK high
2.8
CLK low
2.6
Data after CLK↑
Hold time
MAX
ns
0.4
CLK high or low
ns
0.9
A-to-B Switching Characteristics
over recommended ranges of supply voltage and operating free-air temperature,
VTT = 1.5 V, VREF = 1 V, and VERC = VCC or GND for GTL+ (see Figure 1)
PARAMETER
MAX
3
5.1
2.9
6.5
3.4
5.4
2.7
6.2
3.5
5.7
2.8
6.7
3.3
5.4
3
6.3
tPLH
tPHL
ten
tdis
ten
tdis
tPLH
tPHL
tPLH
tPHL
tPLH
tPHL
ten
tdis
ten
tdis
10
TYP
160
tPHL
(1)
(2)
MIN
fmax
tPLH
tf
TO
(OUTPUT)
tPLH
tPHL
tr
FROM
(INPUT)
VERC = GND
VERC = VCC
VERC = GND
VERC = VCC
A
VERC = VCC
B
CLK
VERC = VCC
B
LEAB
VERC = VCC
B
OEAB
VERC = VCC
B
OE
VERC = VCC
B
A
VERC = GND
B
CLK
VERC = GND
B
LEAB
VERC = GND
B
OEAB
VERC = GND
B
OE
VERC = GND
B
Transition time, B outputs (0.6 V to 1.3 V)
Transition time, B outputs (1.3 V to 0.6 V)
UNIT
MHz
3
5.5
3.6
5.8
2.3
4.3
2
4.4
2.7
4.8
1.9
4.5
2.8
4.9
2.1
4.9
2.5
4.5
2.1
4.4
2.5
4.6
2.9
4.9
0.9
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
1.7
1.6
ns
2.4
tsk(o) (1)
Skew between drivers in the same package
switching in the same direction
1
ns
tsk(o) (2)
Skew between drivers
switching in any direction in the same package
1
ns
Skew values are applicable for through mode only.
Skew values are applicable for CLK mode only, with all outputs switching simultaneously.
SN74GTL1655
16-BIT LVTTL-TO-GTL/GTL+ UNIVERSAL BUS TRANSCEIVER
WITH LIVE INSERTION
www.ti.com
SCBS696I – JULY 1997 – REVISED APRIL 2005
B-to-A Switching Characteristics
over recommended ranges of supply voltage and operating free-air temperature,
VTT = 1.5 V and VREF = 1 V for GTL+ (see Figure 1)
PARAMETER
TO
(OUTPUT)
MIN
MAX
fmax
160
tPLH
2
4.8
2.4
4.7
1.6
4.4
1.5
3.4
tPHL
tPLH
tPHL
tPLH
tPHL
ten
tdis
ten
tdis
(1)
(2)
FROM
(INPUT)
B
A
CLK
A
LEBA
A
OEBA
A
OE
A
UNIT
MHz
1.7
4
1.4
3.5
1.2
4.2
1.2
6.1
1.2
4.7
1.2
6.3
ns
ns
ns
ns
ns
tsk(o) (1)
Skew between drivers in the same package
switching in the same direction
1
ns
tsk(o) (2)
Skew between drivers
switching in any direction in the same package
1
ns
Skew values are applicable for through mode only.
Skew values are applicable for CLK mode only, with all outputs switching simultaneously.
11
SN74GTL1655
16-BIT LVTTL-TO-GTL/GTL+ UNIVERSAL BUS TRANSCEIVER
WITH LIVE INSERTION
www.ti.com
SCBS696I – JULY 1997 – REVISED APRIL 2005
PARAMETER MEASUREMENT INFORMATION
VTT
6V
500 Ω
From Output
Under Test
S1
Open
TEST
tPLH/tPHL
tPLZ/tPZL
tPHZ/tPZH
GND
CL = 50 pF
(see Note A)
500 Ω
12.5 Ω
From Output
Under Test
CL = 30 pF
(see Note A)
S1
Open
6V
GND
LOAD CIRCUIT FOR B OUTPUTS
LOAD CIRCUIT FOR A OUTPUTS
tw
3V
3V
Timing
Input
1.5 V
0V
1.5 V
1.5 V
Input
tsu
0V
VOLTAGE WAVEFORMS
PULSE DURATION
3V
Input
Test
Point
1.5 V
1.5 V
th
3V
Data Input
A Port
1.5 V
Data Input
B Port
VREF
1.5 V
0V
VTT
VREF
0V
0V
tPLH
VOLTAGE WAVEFORMS
SETUP AND HOLD TIMES
tPHL
VTT
Output
VREF
VREF
3V
VOL
VOLTAGE WAVEFORMS
PROPAGATION DELAY TIMES
(CLK to B port)
1.5 V
tPZL
1.5 V
0V
tPLH
Output
Waveform 1
S1 at 6 V
(see Note B)
1.5 V
1.5 V
VOL
VOLTAGE WAVEFORMS
PROPAGATION DELAY TIMES
(CLK to A port)
1.5 V
tPLZ
3V
1.5 V
tPZH
tPHL
VOH
Output
1.5 V
0V
3V
Input
Output
Control
Output
Waveform 2
S1 at GND
(see Note B)
VOL + 0.3 V
VOL
tPHZ
VOH
1.5 V
VOH − 0.3 V
≈0 V
VOLTAGE WAVEFORMS
ENABLE AND DISABLE TIMES
(A port)
NOTES: A. CL includes probe and jig capacitance.
B. Waveform 1 is for an output with internal conditions such that the output is low, except when disabled by the output control.
Waveform 2 is for an output with internal conditions such that the output is high, except when disabled by the output control.
C. All input pulses are supplied by generators having the following characteristics: PRR ≤ 10 MHz, ZO = 50 Ω, tr ≤ 2.5 ns, tf ≤ 2.5 ns.
D. The outputs are measured one at a time, with one transition per measurement.
E. tPLZ and tPHZ are the same as tdis.
F. tPZL and tPZH are the same as ten.
Figure 1. Load Circuits and Voltage Waveforms
12
PACKAGE OPTION ADDENDUM
www.ti.com
10-Dec-2020
PACKAGING INFORMATION
Orderable Device
Status
(1)
Package Type Package Pins Package
Drawing
Qty
Eco Plan
(2)
Lead finish/
Ball material
MSL Peak Temp
Op Temp (°C)
Device Marking
(3)
(4/5)
(6)
SN74GTL1655DGGR
ACTIVE
TSSOP
DGG
64
2000
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 85
GTL1655
(1)
The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)
RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance
do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may
reference these types of products as "Pb-Free".
RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption.
Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of
