TI GTLPH16927

SN74GTLPH16927
18-BIT LVTTL-TO-GTLP BUS TRANSCEIVER
WITH SOURCE-SYNCHRONOUS CLOCK OUTPUTS
SCES413 – OCTOBER 2002
D
D
D
D
D
D
D
D
D
D
D
D
D
D
Member of the Texas Instruments
Widebus Family
TI-OPC Circuitry Limits Ringing on
Unevenly Loaded Backplanes
OEC Circuitry Improves Signal Integrity
and Reduces Electromagnetic Interference
Bidirectional Interface Between GTLP
Signal Levels and LVTTL Logic Levels
GTLP Buffered SYSCLK Signal (SSCLK) for
Source-Synchronous Applications
LVTTL Interfaces Are 5-V Tolerant
Medium-Drive GTLP Outputs (50 mA)
LVTTL Outputs (–24 mA/24 mA)
GTLP Rise and Fall Times Designed for
Optimal Data-Transfer Rate and Signal
Integrity in Distributed Loads
Ioff, Power-Up 3-State, and BIAS VCC
Support Live Insertion
Bus Hold on A-Port Data Inputs
Distributed VCC and GND Pins Minimize
High-Speed Switching Noise
Latch-Up Performance Exceeds 100 mA Per
JESD 78, Class II
ESD Protection Exceeds JESD 22
– 2000-V Human-Body Model (A114-A)
– 200-V Machine Model (A115-A)
– 1000-V Charged-Device Model (C101)
DGG OR DGV PACKAGE
(TOP VIEW)
DIR
OE
A1
GND
A2
A3
VCC
A4
A5
A6
GND
A7
A8
A9
A10
A11
A12
GND
A13
A14
A15
VCC
A16
A17
GND
A18
CLKOUT
CKOE
1
56
2
55
3
54
4
53
5
52
6
51
7
50
8
49
9
48
10
47
11
46
12
45
13
44
14
43
15
42
16
41
17
40
18
39
19
38
20
37
21
36
22
35
23
34
24
33
25
32
26
31
27
30
28
29
FSTA
BIAS VCC
B1
GND
B2
B3
VREF
B4
B5
B6
GND
B7
B8
B9
B10
B11
B12
GND
B13
B14
B15
CMS
B16
B17
GND
B18
SSCLK
SYSCLK
description/ordering information
The SN74GTLPH16927 is a medium-drive, 18-bit bus transceiver that provides LVTTL-to-GTLP and
GTLP-to-LVTTL signal-level translation. The device allows for transparent and latched modes of data transfer.
Additionally, with the use of the clock-mode select (CMS) input, the device can be used in source-synchronous
and clock-synchronous applications. Source-synchronous applications require the skew between the clock
output and data output to be minimized for optimum maximum-frequency system performance. In order to
reduce this skew, a flexible setup-time adjustment (FSTA) feature is incorporated into the device that sets a
predetermined delay between the clock and data. The CMS and direction (DIR) inputs control the mode of the
device.
ORDERING INFORMATION
PACKAGE†
TA
–40°C to 85°C
ORDERABLE
PART NUMBER
TOP-SIDE
MARKING
TSSOP – DGG
Tape and reel
SN74GTLPH16927GR
GTLPH16927
TVSOP – DGV
Tape and reel
SN74GTLPH16927VR
GL927
VFBGA – GQL
Tape and reel
SN74GTLPH16927KR
GL927
† Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines
are available at www.ti.com/sc/package.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
OEC, TI-OPC, and Widebus are trademarks of Texas Instruments.
Copyright  2002, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
1
SN74GTLPH16927
18-BIT LVTTL-TO-GTLP BUS TRANSCEIVER
WITH SOURCE-SYNCHRONOUS CLOCK OUTPUTS
SCES413 – OCTOBER 2002
description/ordering information (continued)
The system clock (SYSCLK) and CLKOUT pins are LVTTL compatible, while the source-synchronous I/O is
GTLP compatible. The benefits include compensation for output-to-output skew coming from the driver itself,
and compensation for process skew if more than one driver is used. The device provides a high-speed interface
between cards operating at LVTTL logic levels and a backplane operating at GTLP signal levels. High-speed
(about three times faster than standard TTL or LVTTL) backplane operation is a direct result of GTLP’s reduced
output swing (<1 V), reduced input threshold levels, improved differential input, OEC circuitry, and TI-OPC
circuitry. Improved GTLP OEC and TI-OPC circuits minimize bus-settling time and have been designed and
tested using several backplane models. The medium drive allows incident-wave switching in heavily loaded
backplanes with equivalent load impedance down to 11 Ω.
GTLP is the Texas Instruments derivative of the Gunning Transceiver Logic (GTL) JEDEC standard JESD 8-3.
The ac specification of the SN74GTLPH16927 is given only at the preferred higher noise-margin GTLP, but the
user has the flexibility of using this device at either GTL (VTT = 1.2 V and VREF = 0.8 V) or GTLP (VTT = 1.5 V
and VREF = 1 V) signal levels. For information on using GTLP devices in FB+/BTL applications, refer to TI
application reports, Texas Instruments GTLP Frequently Asked Questions, literature number SCEA019, and
GTLP in BTL Applications, literature number SCEA017.
Normally, the B port operates at GTLP signal levels. The A-port and control inputs operate at LVTTL logic levels,
but are 5-V tolerant and are compatible with TTL and 5-V CMOS inputs. VREF is the B-port differential input
reference voltage.
This device is fully specified for live-insertion applications using Ioff, power-up 3-state, and BIAS VCC. The Ioff
circuitry disables the outputs, preventing damaging current backflow through the device when it is powered
down. The power-up 3-state circuitry places the outputs in the high-impedance state during power up and power
down, which prevents driver conflict. The BIAS VCC circuitry precharges and preconditions the B-port
input/output connections, preventing disturbance of active data on the backplane during card insertion or
removal, and permits true live-insertion capability.
This GTLP device features TI-OPC circuitry, which actively limits the overshoot caused by improperly
terminated backplanes, unevenly distributed cards, or empty slots during low-to-high signal transitions. This
improves signal integrity, which allows adequate noise margin to be maintained at higher frequencies.
Active bus-hold circuitry holds unused or undriven LVTTL data inputs at a valid logic state. Use of pullup or
pulldown resistors with the bus-hold circuitry is not recommended.
When VCC is between 0 and 1.5 V, the device is in the high-impedance state during power up or power down.
However, to ensure the high-impedance state above 1.5 V, the output-enable (OE) input should be tied to VCC
through a pullup resistor; the minimum value of the resistor is determined by the current-sinking capability of
the driver.
2
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
SN74GTLPH16927
18-BIT LVTTL-TO-GTLP BUS TRANSCEIVER
WITH SOURCE-SYNCHRONOUS CLOCK OUTPUTS
SCES413 – OCTOBER 2002
GQL PACKAGE
(TOP VIEW)
1
2
3
4
5
terminal assignments
6
A
B
C
D
E
F
G
1
2
3
4
5
6
A
A1
OE
DIR
FSTA
BIAS VCC
B1
B
A3
A2
GND
GND
B2
B3
C
A5
A4
B5
A7
A6
VREF
GND
B4
D
VCC
GND
B6
B7
E
A9
A8
B8
B9
F
A10
A11
B11
B10
G
A12
A13
GND
GND
B13
B12
H
A14
A15
CMS
B15
B14
GND
B17
B16
SYSCLK
SSCLK
B18
H
J
A16
A17
VCC
GND
J
K
A18
CLKOUT
CKOE
K
functional description
The SN74GTLPH16927 is a medium-drive (50 mA), 18-bit bus transceiver containing D-type latches and D-type
flip-flops for data-path operation in transparent or latched modes and can replace any of the functions shown
in Table 1. Data polarity is noninverting.
Table 1. SN74GTLPH16927 Bus-Transceiver Replacement Functions
8 BIT
9 BIT
10 BIT
16 BIT
18 BIT
Transceiver
FUNCTION
’245, ’623, ’645
’863
’861
’16245, ’16623
’16863
Buffer/driver
’241, ’244, ’541
’827
’16241, ’16244, ’16541
’16825
’16543
’16472
’16373
’16843
Latched transceiver
Latch
’543
’373, ’573
’843
’841
SN74GTLPH16927 bus transceiver replaces all above functions
Additionally, the device allows for conversion of the system clock (SYSCLK) to GTLP signal levels (SSCLK) and
LVTTL signal levels (CLKOUT). It also provides conversion of a GTLP source-synchronous clock to LVTTL
signal levels (CLKOUT).
The device allows for conversion of the LVTTL system clock (SYSCLK) to GTLP (SSCLK) and LVTTL
(CLKOUT) signal levels when used as the transmitter and GTLP source-synchronous clock (SSCLK) to LVTTL
(CLKOUT) signal levels when used as the receiver in source-synchronous applications. Source-synchronous
operation removes time-of-flight restrictions and allows for increased data throughput. CMS is used to switch
between system-synchronous mode and clock-synchronous mode. The clock output-enable (CKOE) input is
used to switch between latched and transparent mode.
Data flow in each direction is controlled by CKOE, clock (SYSCLK or SSCLK), DIR, and OE. OE controls the
18 bits of data. The CLKOUT/SSCLK buffered clock path for the A-to-B and B-to-A directions is controlled by
CKOE. In the data-isolation mode (OE high, CKOE low), A data can be stored in one register and/or B data can
be stored in the other register.
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
3
SN74GTLPH16927
18-BIT LVTTL-TO-GTLP BUS TRANSCEIVER
WITH SOURCE-SYNCHRONOUS CLOCK OUTPUTS
SCES413 – OCTOBER 2002
logic diagram (positive logic)
OE
DIR
CMS
CKOE
2
1
35
28
CLKOUT
FSTA
27
56
30
SYSCLK
SSCLK
29
MUX
A1
3
One of Eighteen
Channels
1D
C1
54
CLK
B1
1D
C1
50
CLK
To 17 Other Channels
Pin numbers shown are for the DGG and DGV packages.
4
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
VREF
SN74GTLPH16927
18-BIT LVTTL-TO-GTLP BUS TRANSCEIVER
WITH SOURCE-SYNCHRONOUS CLOCK OUTPUTS
SCES413 – OCTOBER 2002
Function Tables
A-TO-B DIRECTION
INPUTS
OUTPUTS
CKOE
OE
CMS
DIR
SYSCLK
A
SSCLK
CLKOUT
B
L
L
X
L
H or L
X
SYSCLK
SYSCLK
L
L
X
L
↑
L
SYSCLK
SYSCLK
B1
L
L
L
X
L
↑
H
SYSCLK
SYSCLK
H
L
H
X
L
X
X
SYSCLK
SYSCLK
Z
H
L
X
L
X
L
Z
Z
L
H
L
X
L
X
H
Z
Z
H
H
H
X
X
X
X
Z
Z
Z
L
H
H
X
↑
X
SYSCLK
SYSCLK
Z
L
H
H
X
H or L
X
SYSCLK
SYSCLK
Z
MODE
Latched storage of A
Clocked storage of A
S
Source
synchronous
Data isolation
Transparent transmission of A
Isolation
Transmit SYSCLK
B-TO-A DIRECTION
INPUTS
OUTPUTS
CKOE
OE
CMS
DIR
SYSCLK
SSCLK
B
SSCLK
CLKOUT
A
L
L
L
H
X
H or L
X
Input
SSCLK
L
L
L
H
X
↑
L
Input
SSCLK
A1
L
L
L
L
H
X
↑
H
Input
SSCLK
H
L
H
L
H
X
X
X
Input
SSCLK
Z
L
L
H
H
H or L
Output
X
SYSCLK
SYSCLK
L
L
H
H
↑
Output
L
SYSCLK
SYSCLK
A1
L
L
L
H
H
↑
Output
H
SYSCLK
SYSCLK
H
L
H
H
H
X
Output
X
SYSCLK
SYSCLK
Z
H
L
X
H
X
Output
L
Z
Z
L
H
L
X
H
X
Output
H
Z
Z
H
H
H
X
X
X
Output
X
Z
Z
Z
L
H
L
X
X
↑
X
Input
SSCLK
Z
L
H
L
X
X
H or L
X
Input
SSCLK
Z
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
MODE
Latched storage of B
Clocked storage of B
S
Source
synchronous
Data isolation
Latched storage of B
Clocked storage of B
Cl k
Clock
synchronous
Data isolation
Transparent transmission of B
Isolation
Receive SSCLK
5
SN74GTLPH16927
18-BIT LVTTL-TO-GTLP BUS TRANSCEIVER
WITH SOURCE-SYNCHRONOUS CLOCK OUTPUTS
SCES413 – OCTOBER 2002
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)†
Supply voltage range, VCC and BIAS VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.5 V to 4.6 V
Input voltage range, VI (see Note 1): A-port and control inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.5 V to 7 V
B port and VREF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.5 V to 4.6 V
Voltage range applied to any output in the high-impedance or power-off state, VO
(see Note 1): A port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.5 V to 7 V
B port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.5 V to 4.6 V
Current into any output in the low state, IO: A port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 mA
B port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 mA
Current into any A-port output in the high state, IO (see Note 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 mA
Continuous current through each VCC or GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±100 mA
Input clamp current, IIK (VI < 0) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –50 mA
Output clamp current, IOK (VO < 0) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –50 mA
Package thermal impedance, θJA (see Note 3): DGG package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64°C/W
DGV package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48°C/W
GQL package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42°C/W
Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65°C to 150°C
† Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTES: 1. The input and output negative-voltage ratings may be exceeded if the input and output clamp-current ratings are observed.
2. This current flows only when the output is in the high state and VO > VCC.
3. The package thermal impedance is calculated in accordance with JESD 51-7.
6
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
SN74GTLPH16927
18-BIT LVTTL-TO-GTLP BUS TRANSCEIVER
WITH SOURCE-SYNCHRONOUS CLOCK OUTPUTS
SCES413 – OCTOBER 2002
recommended operating conditions (see Notes 4 through 7)
VCC,
BIAS VCC
Supply voltage
VTT
Termination voltage
VREF
Reference voltage
VI
Input voltage
VIH
High level input voltage
High-level
VIL
Low level input voltage
Low-level
IIK
IOH
Input clamp current
High-level output current
IOL
Low level output current
Low-level
∆t/∆v
Input transition rise or fall rate
∆t/∆VCC
TA
Power-up ramp rate
MIN
NOM
MAX
UNIT
3.15
3.3
3.45
V
GTL
1.14
1.2
1.26
GTLP
1.35
1.5
1.65
GTL
0.74
0.8
0.87
GTLP
0.87
1
1.1
VCC
VTT
5.5
B port and SSCLK
Except B port and SSCLK
B port and SSCLK
Except B port, FSTA, and SSCLK
VREF+0.05
2
B port and SSCLK
V
V
V
V
VREF–0.05
0.8
V
–18
mA
A port and CLKOUT
–24
mA
A port and CLKOUT
24
B port and SSCLK
50
Except B port, FSTA, and SSCLK
Outputs enabled
10
–40
ns/V
µs/V
20
Operating free-air temperature
mA
85
°C
NOTES: 4. 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.
5. Proper connection sequence for use of the B-port I/O precharge feature is GND and BIAS VCC = 3.3 V first, I/O second, and
VCC = 3.3 V last, because the BIAS VCC precharge circuitry is disabled when any VCC pin is connected. The control and VREF inputs
can be connected anytime, but normally are connected during the I/O stage. If B-port precharge is not required, any connection
sequence is acceptable but, generally, GND is connected first.
6. VTT and RTT can be adjusted to accommodate backplane impedances if the dc recommended IOL ratings are not exceeded.
7. VREF can be adjusted to optimize noise margins, but normally is two-thirds VTT. TI-OPC circuitry is enabled in the A-to-B direction
and is activated when VTT > 0.7 V above VREF. If operated in the A-to-B direction, VREF should be set to within 0.6 V of VTT to
minimize current drain.
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
7
SN74GTLPH16927
18-BIT LVTTL-TO-GTLP BUS TRANSCEIVER
WITH SOURCE-SYNCHRONOUS CLOCK OUTPUTS
SCES413 – OCTOBER 2002
electrical characteristics over recommended operating free-air temperature range for GTLP
(unless otherwise noted)
PARAMETER
VIK
VOH
A portt and
d
CLKOUT
A portt and
d
CLKOUT
VOL
B port and SSCLK
TEST CONDITIONS
MIN
VCC = 3.15 V,
VCC = 3.15 V to 3.45 V,
II = –18 mA
IOH = –100 µA
VCC = 3
3.15
15 V
IOH = –12 mA
IOH = –24 mA
TYP†
MAX
UNIT
–1.2
V
VCC–0.2
2.4
V
2
IOL = 100 µA
IOL = 12 mA
0.2
0.5
VCC = 3.15 V to 3.45 V,
IOL = 24 mA
IOL = 100 µA
0.2
VCC = 3.15 V
IOL = 10 mA
IOL = 40 mA
IOL = 50 mA
0.55
VCC = 3.15 V to 3.45 V,
VCC = 3
3.15
15 V
0.4
0.2
V
0.4
SYSCLK and
control inputs
VCC = 3.45 V,
VI = 0 to 5.5 V
±10
B port and SSCLK
VCC = 3.45 V, VREF within 0.6 V of VTT,
VO = 0 to 2.3 V
±10
CLKOUT
VCC = 3.45 V,
VO = 0 to 5.5 V
±10
IOZH‡
IOZL‡
A port
VCC = 3.45 V,
VO = VCC
10
µA
A port
VCC = 3.45 V,
VO = GND
–10
µA
IBHL§
IBHH¶
A port
VCC = 3.15 V,
VCC = 3.15 V,
VI = 0.8 V
VI = 2 V
IBHLO#
IBHHO||
A port
VCC = 3.45 V,
VCC = 3.45 V,
VI = 0 to VCC
VI = 0 to VCC
VCC = 3.45 V, IO = 0,
VI (A-port or control input) = VCC or GND,
VI (B port) = VTT or GND
Outputs high
50
Outputs low
50
Outputs disabled
50
II
IOZ‡
ICC
A port
A port
t B port,
t or
A port,
SSCLK
Ci
Ciio
SYSCLK inputs
Control inputs
A port
B port or SSCLK
µA
75
µA
–75
µA
500
µA
µA
–500
VCC = 3.45 V, One A-port or control input at VCC – 0.6 V,
Other A-port or control inputs at VCC or GND
∆ICCk
µA
1.5
VI = 3.15 V or 0
VI = 3.15 V or 0
3.5
5
3.5
5.5
VO = 3.15 V or 0
VO = 1.5 V or 0
7.5
10
9
11
mA
mA
pF
pF
Co
CLKOUT
VO = 3.15 V or 0
6
7.5
pF
† All typical values are at VCC = 3.3 V, TA = 25°C.
‡ For I/O ports, the parameter II includes the off-state output leakage current.
§ The bus-hold circuit can sink at least the minimum low sustaining current at VILmax. IBHL should be measured after lowering VIN to GND and
then raising it to VILmax.
¶ The bus-hold circuit can source at least the minimum high sustaining current at VIHmin. IBHH should be measured after raising VIN to VCC and
then lowering it to VIHmin.
# An external driver must source at least IBHLO to switch this node from low to high.
|| An external driver must sink at least IBHHO to switch this node from high to low.
k This is the increase in supply current for each input that is at the specified TTL voltage level, rather than VCC or GND.
8
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
SN74GTLPH16927
18-BIT LVTTL-TO-GTLP BUS TRANSCEIVER
WITH SOURCE-SYNCHRONOUS CLOCK OUTPUTS
SCES413 – OCTOBER 2002
hot-insertion specifications for A port over recommended operating free-air temperature range
PARAMETER
TEST CONDITIONS
MIN
MAX
UNIT
10
µA
VO = 0.5 V to 3 V,
VI or VO = 0 to 5.5 V
OE = 0
±30
µA
VO = 0.5 V to 3 V,
OE = 0
±30
µA
Ioff
IOZPU
VCC = 0,
VCC = 0 to 1.5 V,
BIAS VCC = 0,
IOZPD
VCC = 1.5 V to 0,
live-insertion specifications for B port over recommended operating free-air temperature range
PARAMETER
TEST CONDITIONS
µA
±30
µA
BIAS VCC = 0,
VO = 0.5 V to 1.5 V, OE = 0
±30
µA
5
mA
10
µA
IOZPD
VCC = 1.5 V to 0,
VCC = 0 to 3.15 V
VO
IO
VCC = 0,
UNIT
BIAS VCC = 0,
BIAS VCC = 0,
VCC = 3.15 V to 3.45 V
VCC = 0,
MAX
10
VCC = 0,
VCC = 0 to 1.5 V,
ICC (BIAS VCC)
MIN
VI or VO = 0 to 1.5 V
VO = 0.5 V to 1.5 V, OE = 0
Ioff
IOZPU
BIAS VCC = 3
3.15
15 V to 3
3.45
45 V
V,
VO (B port) = 0 to 1.5
15V
BIAS VCC = 3.3 V,
IO = 0
VO (B port) = 0.6 V
BIAS VCC = 3.15 V to 3.45 V,
0.95
1.05
V
µA
–1
timing requirements over recommended ranges of supply voltage and operating free-air
temperature, VTT = 1.5 V and VREF = 1 V for GTLP (unless otherwise noted)
MIN
fclock
tw
tsu
th
Clock frequency
Pulse duration
Setup time
Hold time
POST OFFICE BOX 655303
CKOE high
2.8
SYSCLK or SSCLK high or low
3.3
A before SYSCLK↑
1.2
B before SYSCLK↑ or SSCLK↑
2.6
A before CKOE↓
1.2
B before CKOE↓
2.6
A after SYSCLK↑
0.3
B after SYSCLK↑ or SSCLK↑
0.8
A after CKOE↓
1.1
B after CKOE↓
0.3
• DALLAS, TEXAS 75265
MAX
UNIT
175
MHz
ns
ns
ns
9
SN74GTLPH16927
18-BIT LVTTL-TO-GTLP BUS TRANSCEIVER
WITH SOURCE-SYNCHRONOUS CLOCK OUTPUTS
SCES413 – OCTOBER 2002
switching characteristics over recommended ranges of supply voltage and operating free-air
temperature, VTT = 1.5 V and VREF = 1 V for GTLP (see Figure 1)
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
MIN
A
B
175
fmax
tPLH
A
B
CKOE
B
SYSCLK
B
OE
B
tPHL
tPLH
tPHL
tPLH
tPHL
ten
tdis
MAX
UNIT
MHz
3.1
6.5
3.1
6.5
3.6
7.1
3.6
7.1
3.7
7.3
3.7
7.3
3.3
7
3.3
7
ns
ns
ns
ns
tr
Rise time, B and SSCLK outputs
(20% to 80%)
2.2
ns
tf
Fall time, B and SSCLK outputs
(80% to 20%)
1.5
ns
tPLH
tPHL
B
A
tPLH
tPHL
CKOE
A
tPLH
tPHL
SYSCLK
A
tPLH
tPHL
SSCLK
A
tPLH
tPHL
SYSCLK
CLKOUT
tPLH
tPHL
SSCLK
CLKOUT
ten
tdis
OE
A
ten
tdis
CKOE
CLKOUT
† All typical values are at VCC = 3.3 V, TA = 25°C
10
TYP†
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
2
5.3
2
5.3
2.5
5.9
2.5
5.9
2.4
5.9
2.4
5.9
2.9
6.7
2.9
6.7
3.6
7.5
3.6
7.5
4
8.5
4
8.5
2.1
5.8
2.6
6.9
2.2
5.9
1.8
6
ns
ns
ns
ns
ns
ns
ns
ns
SN74GTLPH16927
18-BIT LVTTL-TO-GTLP BUS TRANSCEIVER
WITH SOURCE-SYNCHRONOUS CLOCK OUTPUTS
SCES413 – OCTOBER 2002
skew characteristics over recommended ranges of supply voltage and operating free-air
temperature, VREF = 1 V (unless otherwise noted); standard lumped loads, CL = 30 pF for B port
(see Figure 1)†
PARAMETER
tsk(LH)‡
tsk(HL)‡
tsk(LH)‡
tsk(HL)‡
tsk(LH)‡
tsk(HL)‡
FROM
(INPUT)
TO
(OUTPUT)
SYSCLK
B
SYSCLK
SSCLK → Bn
(see Figure 2)
SYSCLK
SYSCLK
SYSCLK
TEST
CONDITIONS
FSTA
tsk(prLH)§
tsk(prHL)§
SYSCLK
SYSCLK
MAX
0.5
SSCLK → Bn
(see Figure 2)
SSCLK → Bn
(see Figure 2)
SSCLK → Bn
(see Figure 2)
0.5
GND
GND
VCC
VCC
VCC = 3.15 V, T = 85°C
3.4
4.7
VCC = 3.3 V, T = 25°C
3.2
4.5
VCC = 3.45 V, T = –40°C
3.1
4.4
VCC = 3.15 V, T = 85°C
3.2
4.6
VCC = 3.3 V, T = 25°C
2.8
4.1
VCC = 3.45 V, T = –40°C
2.4
3.7
VCC = 3.15 V, T = 85°C
7.1
8.9
VCC = 3.3 V, T = 25°C
6.6
8.4
VCC = 3.45 V, T = –40°C
6.3
8
VCC = 3.15 V, T = 85°C
7.2
9
VCC = 3.3 V, T = 25°C
6.5
8.2
6
7.6
VCC = 3.45 V, T = –40°C
tsk(t)‡
MIN
1.3
B
1.8
B
2.8
UNIT
ns
ns
ns
ns
ns
ns
ns
† Actual skew values between the GTLP outputs could vary on the backplane due to the loading and impedance seen by the device.
‡ tsk(LH)/tsk(HL) and tsk(t) – Output-to-output skew is defined as the absolute value of the difference between the actual propagation delay for all
outputs with the same packaged device. The specifications are given for specific worst-case VCC and temperature. The specifications apply to
any outputs switching in the same direction, either high to low [tsk(HL)], low to high [tsk(LH)], or in opposite directions, both low to high and high
to low [tsk(t)].
§ tsk(prLH) or tsk(prHL) – Part-to-part skew is designed as the absolute value of the difference between the actual propagation delay for all outputs
from device to device. The parameter is specified for a specific worst-case VCC and temperature. Furthermore, these values are provided by
TI SPICE simulations.
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
11
SN74GTLPH16927
18-BIT LVTTL-TO-GTLP BUS TRANSCEIVER
WITH SOURCE-SYNCHRONOUS CLOCK OUTPUTS
SCES413 – OCTOBER 2002
PARAMETER MEASUREMENT INFORMATION
1.5 V
6V
S1
500 Ω
From Output
Under Test
Open
GND
CL = 50 pF
(see Note A)
500 Ω
25 Ω
S1
Open
6V
GND
TEST
tPLH/tPHL
tPLZ/tPZL
tPHZ/tPZH
From Output
Under Test
Test
Point
CL = 30 pF
(see Note A)
LOAD CIRCUIT FOR B OUTPUTS
LOAD CIRCUIT FOR A OUTPUTS
tw
3V
3V
1.5 V
Input
1.5 V
Timing
Input
1.5 V
0V
0V
VOLTAGE WAVEFORMS
PULSE DURATION
tsu
th
VOH
Data
Input
VM
VM
0V
3V
Input
1.5 V
1.5 V
0V
tPLH
tPHL
VOLTAGE WAVEFORMS
SETUP AND HOLD TIMES
(VM = 1.5 V for A port and 1 V for B port)
(VOH = 3 V for A port and 1.5 V for B port)
VOH
Output
1V
1V
3V
VOL
VOLTAGE WAVEFORMS
PROPAGATION DELAY TIMES
(A port to B port)
1V
1V
0V
tPLH
1.5 V
1.5 V
0V
Output
Waveform 1
S1 at 6 V
(see Note B)
tPLZ
3V
1.5 V
VOL + 0.3 V
VOL
tPHZ
tPZH
tPHL
VOH
Output
1.5 V
tPZL
1.5 V
Input
Output
Control
1.5 V
VOL
Output
Waveform 2
S1 at GND
(see Note B)
1.5 V
VOH
VOH – 0.3 V
≈0 V
VOLTAGE WAVEFORMS
ENABLE AND DISABLE TIMES
(A port)
VOLTAGE WAVEFORMS
PROPAGATION DELAY TIMES
(B port to 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 ns, tf ≤ 2 ns.
D. The outputs are measured one at a time with one transition per measurement.
E. Load circuit for A outputs is also used for CLKOUT; load circuit for B outputs is also used for SSCLK.
Figure 1. Load Circuits and Voltage Waveforms
12
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
SN74GTLPH16927
18-BIT LVTTL-TO-GTLP BUS TRANSCEIVER
WITH SOURCE-SYNCHRONOUS CLOCK OUTPUTS
SCES413 – OCTOBER 2002
1.5 V
25 Ω
From Output
Under Test
Test
Point
CL = 30 pF
(see Note A)
LOAD CIRCUIT FOR B OUTPUTS
A
SYSCLK
B1
through
B18
tsk(LH)
SYSCLK to B
tsk(HL)
SYSCLK to B
SSCLK
tsk(LH) min
SYSCLK to SSCLK → Bn
FSTA (Fast)
tsk(HL) min
SYSCLK to SSCLK → Bn
FSTA (Fast)
tsk(LH) max
SYSCLK to SSCLK → Bn
FSTA (Fast)
tsk(HL) max
SYSCLK to SSCLK → Bn
FSTA (Fast)
tsk(LH) min
SYSCLK to SSCLK → Bn
FSTA (Slow)
tsk(HL) min
SYSCLK to SSCLK → Bn
FSTA (Slow)
tsk(LH) max
SYSCLK to SSCLK → Bn
FSTA (Slow)
tsk(HL) max
SYSCLK to SSCLK → Bn
FSTA (Slow)
NOTES: A.
B.
C.
D.
CL includes probe and jig capacitance.
All input pulses are supplied by generators having the following characteristics: PRR ≤ 10 MHz, ZO = 50 Ω, tr ≤ 2 ns, tf ≤ 2 ns.
The outputs are measured one at a time with one transition per measurement.
Load circuit for B outputs also is used for SSCLK.
Figure 2. Load Circuit and SYSCLK to SSCLK → Bn Skew Waveforms
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
13
SN74GTLPH16927
18-BIT LVTTL-TO-GTLP BUS TRANSCEIVER
WITH SOURCE-SYNCHRONOUS CLOCK OUTPUTS
SCES413 – OCTOBER 2002
DISTRIBUTED-LOAD BACKPLANE SWITCHING CHARACTERISTICS
The preceding switching characteristics table shows the switching characteristics of the device into a lumped load
(Figure 1). However, the designer’s backplane application probably is a distributed load. The physical representation
is shown in Figure 3. This backplane, or distributed load, can be closely approximated to a resistor inductance
capacitance (RLC) circuit, as shown in Figure 4. This device has been designed for optimum performance in this RLC
circuit. The following switching characteristics table shows the switching characteristics of the device into the RLC
load, to help the designer to better understand the performance of the GTLP device in this typical backplane. See
www.ti.com/sc/gtlp for more information.
1.5 V
ZO = 70 Ω
.25”
2”
2”
1.5 V
38 Ω
38 Ω
1.5 V
.25”
19 Ω
Conn.
1”
Conn.
1”
Conn.
1”
Conn.
LL = 19 nH
From Output
Under Test
1”
Test
Point
CL = 9 pF
Rcvr
Rcvr
Rcvr
Slot 2
Slot 19
Slot 20
Drvr
Slot 1
Figure 4. Medium-Drive RLC Network
Figure 3. Medium-Drive Test Backplane
switching characteristics over recommended operating conditions for the bus transceiver
function (unless otherwise noted) (see Figure 4)
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
tPLH
tPHL
A
B
tPLH
tPHL
SYSCLK
B
4.3
4.3
5
5
UNIT
ns
ns
tr
Rise time, B and SSCLK outputs
(20% to 80%)
1.2
ns
tf
Fall time, B and SSCLK outputs
(80% to 20%)
1.8
ns
† All typical values are at VCC = 3.3 V, TA = 25°C. All values are derived from TI SPICE models.
14
TYP†
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
PACKAGE OPTION ADDENDUM
www.ti.com
25-Feb-2005
PACKAGING INFORMATION
Orderable Device
Status (1)
Package
Type
Package
Drawing
Pins Package Eco Plan (2)
Qty
SN74GTLPH16927DGG
PREVIEW
TSSOP
DGG
56
35
Pb-Free
(RoHS)
CU NIPDAU
Level-1-250C-UNLIM
SN74GTLPH16927GR
ACTIVE
TSSOP
DGG
56
2000
Pb-Free
(RoHS)
CU NIPDAU
Level-1-250C-UNLIM
SN74GTLPH16927KR
ACTIVE
VFBGA
GQL
56
1000
None
SNPB
Level-1-240C-UNLIM
SN74GTLPH16927VR
ACTIVE
TVSOP
DGV
56
2000
Pb-Free
(RoHS)
CU NIPDAU
Level-1-250C-UNLIM
Lead/Ball Finish
MSL Peak Temp (3)
(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)
Eco Plan - May not be currently available - please check http://www.ti.com/productcontent for the latest availability information and additional
product content details.
None: Not yet available Lead (Pb-Free).
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements
for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered
at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Green (RoHS & no Sb/Br): TI defines "Green" to mean "Pb-Free" and in addition, uses package materials that do not contain halogens,
including bromine (Br) or antimony (Sb) above 0.1% of total product weight.
(3)
MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDECindustry standard classifications, and peak solder
temperature.
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is
provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the
accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take
reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on
incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited
information may not be available for release.
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI
to Customer on an annual basis.
Addendum-Page 1
MECHANICAL DATA
MPDS006C – FEBRUARY 1996 – REVISED AUGUST 2000
DGV (R-PDSO-G**)
PLASTIC SMALL-OUTLINE
24 PINS SHOWN
0,40
0,23
0,13
24
13
0,07 M
0,16 NOM
4,50
4,30
6,60
6,20
Gage Plane
0,25
0°–8°
1
0,75
0,50
12
A
Seating Plane
0,15
0,05
1,20 MAX
PINS **
0,08
14
16
20
24
38
48
56
A MAX
3,70
3,70
5,10
5,10
7,90
9,80
11,40
A MIN
3,50
3,50
4,90
4,90
7,70
9,60
11,20
DIM
4073251/E 08/00
NOTES: A.
B.
C.
D.
All linear dimensions are in millimeters.
This drawing is subject to change without notice.
Body dimensions do not include mold flash or protrusion, not to exceed 0,15 per side.
Falls within JEDEC: 24/48 Pins – MO-153
14/16/20/56 Pins – MO-194
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
MECHANICAL DATA
MTSS003D – JANUARY 1995 – REVISED JANUARY 1998
DGG (R-PDSO-G**)
PLASTIC SMALL-OUTLINE PACKAGE
48 PINS SHOWN
0,27
0,17
0,50
48
0,08 M
25
6,20
6,00
8,30
7,90
0,15 NOM
Gage Plane
1
0,25
24
0°– 8°
A
0,75
0,50
Seating Plane
0,15
0,05
1,20 MAX
PINS **
0,10
48
56
64
A MAX
12,60
14,10
17,10
A MIN
12,40
13,90
16,90
DIM
4040078 / F 12/97
NOTES: A.
B.
C.
D.
All linear dimensions are in millimeters.
This drawing is subject to change without notice.
Body dimensions do not include mold protrusion not to exceed 0,15.
Falls within JEDEC MO-153
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
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