TI SN55LBC976

SN55LBC976
9-CHANNEL DIFFERENTIAL TRANSCEIVER
SGLS091A – JUNE 1995 – REVISED JANUARY 1997
D
D
D
D
D
D
D
D
D
Nine Differential Channels for the Data and
Control Paths of the Differential Small
Computer Systems Interface (SCSI) and
Intelligent Peripheral Interface (IPI-2)
Meets or Exceeds the Requirements of
ANSI Standard RS-485 and
ISO 8482:1987(E)
Packaged in 380-mil Fine Pitch Ceramic
Flat (WD) Package Using 25-mil
Center-to-Center Spacing
Designed to Operate at 10 Million Transfers
Per Second
Low Disabled Supply Current
1.4 mA Typical
Thermal Shutdown Protection
Power-Up/Power-Down Glitch Protection
Positive and Negative Output Current
Limiting
Open-Circuit Fail-Safe Receiver Design
WD PACKAGE
(TOP VIEW)
GND
BSR
CRE
1A
1DE/RE
2A
2DE/RE
3A
3DE/RE
4A
4DE/RE
VCC
GND
GND
GND
GND
GND
VCC
5A
5DE/RE
6A
6DE/RE
7A
7DE/RE
8A
8DE/RE
9A
9DE/RE
description
The SN55LBC976 is a 9-channel differential
transceiver based on the SN55LBC176
LinASIC cell. Use of TI’s LinBiCMOS† process
technology allows the power reduction necessary
to integrate nine differential transceivers. On-chip
enabling logic makes this device applicable for the
data path (eight data bits plus parity) and the
control path (nine bits) for both the Small
Computer Systems Interface (SCSI) and the
Intelligent Peripheral Interface (IPI-2) standard
data interfaces.
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
CDE2
CDE1
CDE0
9B +
9B –
8B +
8B –
7B +
7B –
6B +
6B –
VCC
GND
GND
GND
GND
GND
VCC
5B +
5B –
4B +
4B –
3B +
3B –
2B +
2B –
1B +
1B –
The switching speed and testing capabilities of the SN55LBC976 are sufficient to transfer data over the data
bus at 10 million transfers per second. Each of the nine channels conforms to the requirements of the ANSI
RS-485 and ISO 8482:1987(E) standards referenced by ANSI X3.129-1986 (IPI), ANSI X3.131-1993 (SCSI-2),
and the proposed SCSI-3 standards.
The SN55LBC976 is characterized for operation from – 55°C to 125°C.
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.
† Patent pending
LinASIC and LinBiCMOS are trademarks of Texas Instruments Incorporated.
Copyright  1997, 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
SN55LBC976
9-CHANNEL DIFFERENTIAL TRANSCEIVER
SGLS091A – JUNE 1995 – REVISED JANUARY 1997
logic diagram (positive logic)†
CDE0
CDE1
54
55
BSR 2
30 1B +
29 1B –
1A 4
1DE/RE 5
2A
2DE/RE
3A
3DE/RE
4A
4DE/RE
6
7
8
9
10
11
Channel 2
Channel 3
Channel 4
32
31
34
33
36
35
2B +
2B –
3B +
3B –
4B +
4B –
CDE0
CDE2 56
CRE
5A
3
BSR
BSR
38 5B +
37 5B –
19
5DE/RE 20
6A
6DE/RE
7A
7DE/RE
8A
8DE/RE
21
22
23
24
25
26
9A 27
9DE/RE
Channel 6
Channel 7
Channel 8
BSR
BSR
CRE
28
POST OFFICE BOX 655303
6B +
6B –
7B +
7B –
8B +
8B –
53 9B +
52 9B –
CDE0
† For additional logic diagrams, see Application Information, Table 1, and Figures 7 through 44.
2
47
46
49
48
51
50
• DALLAS, TEXAS 75265
SN55LBC976
9-CHANNEL DIFFERENTIAL TRANSCEIVER
SGLS091A – JUNE 1995 – REVISED JANUARY 1997
schematics of inputs and outputs
ALL INPUTS EXCEPT CDE0, CDE1, AND CDE2
INPUTS CDE0, CDE1, AND CDE2
VCC
VCC
22 kΩ
Input
Input
50 kΩ
B+ AND B – I/O PORTS
RECEIVER OUTPUT
VCC
VCC
100 kΩ
B+ Only
3 kΩ
18 kΩ
Receiver
Driver
A Output
100 kΩ
B – Only
12 kΩ
1 kΩ
B+ or B –
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)†
Supply voltage range, VCC (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 0.3 V to 7 V
Bus voltage range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 10 V to 15 V
Data I/O and control (A-side) voltage range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 0.3 V to 7 V
Continuous total power dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . internally limited
Operating free-air temperature range, TA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 55°C to 125°C
Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 65°C to 150°C
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260°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.
NOTE 1: All voltage values are with respect to GND.
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
3
SN55LBC976
9-CHANNEL DIFFERENTIAL TRANSCEIVER
SGLS091A – JUNE 1995 – REVISED JANUARY 1997
trecommended operating conditions
Supply voltage, VCC
mode) VO, VI, or VIC
Voltage at any bus terminal (separately or common
common-mode),
B + or B –
High-level input voltage, VIH
All except B + and B –
Low-level input voltage, VIL
All except B + and B –
MIN
NOM
MAX
UNIT
4.75
5
5.25
V
12
–7
2
V
0.8
V
– 60
mA
A
–8
mA
B + or B –
60
mA
8
mA
125
°C
B + or B –
High level output current,
High-level
current IOH
Low level output current,
Low-level
current IOL
V
A
Operating free-air temperature, TA
– 55
device electrical characteristics over recommended ranges of operating conditions (unless
otherwise noted)
PARAMETER
IIH
IIL
ICC
Co
Cpd
d
High level input current
High-level
Low level input current
Low-level
Supply current
TEST CONDITIONS
BSR, A, DE/RE, and CRE
CDE0, CDE1, and CDE2
BSR, A, DE/RE, and CRE
MIN
TYP†
VIH = 2 V
See Figure 3
8V
VIL = 0
0.8
CDE0, CDE1, and CDE2
MAX
UNIT
– 200
µA
100
µA
– 200
µA
100
µA
All drivers and receivers
disabled
BSR and CDE0 at 5 V,
Other inputs at 0 V
1.4
5
mA
All receivers enabled
No load,
VID = 5 V,
All other inputs at 0 V
29
50
mA
All drivers enabled
BSR at 0 V,
No load,
All other inputs at 5 V
4.8
15
mA
Bus-port output capacitance
Power dissipation capacitance‡
B + or B –
16
pF
One driver
460
pF
50
pF
One receiver
† All typical values are at VCC = 5 V, TA = 25°C.
‡ Cpd determines the no-load dynamic current consumption; IS = Cpd
VCC f + ICC.
driver electrical characteristics over recommended ranges of operating conditions (unless
otherwise noted)
PARAMETER
| VOD |
Differential output voltage
IOS
IOZ
Output short-circuit current
4
TEST CONDITIONS
Vtest = –7 V to 12 V,
See Figure 1
High-impedance-state output current
MIN
TYP
1
2
See Figure 2
See receiver input current
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
MAX
UNIT
V
± 250
mA
SN55LBC976
9-CHANNEL DIFFERENTIAL TRANSCEIVER
SGLS091A – JUNE 1995 – REVISED JANUARY 1997
receiver electrical characteristics over recommended ranges of operating conditions (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
TYP†
MAX
VOH
High-level output voltage
VID = 200 mV,
See Figure 3
VOL
Low-level output voltage
VID = – 200 mV,
See Figure 3
IOL = 8 mA,
0.8
0.2
Positive-going input threshold voltage‡
IOH = – 8 mA,
IOH = – 8 mA,
See Figure 3
See Figure 3
VIT +
TA = – 55°C,
0.5
VIT –
Vhys
Negative-going input threshold voltage
IOL = 8 mA,
See Figure 3
II
IOZ
IOH = – 8 mA,
MIN
2.5
Receiver input current
B+ and B –
High-impedance-state
High-im
edance-state out
output
ut current
V
– 0.2
Receiver input hysteresis ( VIT + – VIT – )
UNIT
V
V
V
45
mV
VI = 12 V,
Other input at 0 V,
VCC = 5 V,
See Figure 3
0.7
1.5
mA
VI = 12 V,
Other input at 0 V,
VCC = 0 V,
See Figure 3
0.8
1.5
mA
VI = – 7 V,
Other input at 0 V,
VCC = 5 V,
See Figure 3
– 0.5
–1
mA
VI = – 7 V,
Other input at 0 V,
VCC = 0 V,
See Figure 3
– 0.4
–1
mA
See Figure 3
VO = GND
VO = VCC
– 200
µA
50
† All typical values are at VCC = 5 V, TA = 25°C.
‡ This parameter is not tested to meet RS-485 or SCSI standards at –55°C.
driver switching characteristics over recommended operating conditions (unless otherwise
noted) (see Figure 4)
PARAMETER
TEST CONDITIONS
tdD
Differential delay
y time,, high-to-low-level
g
output ((tdDH) or
low-to-high-level output (tdDL )
tsk(lim)
k(li )
Skew limit,, the maximum difference in propagation
g
delay
y times
between any two drivers on any two devices
VCC = 5 V,
TYP†
MAX
4
30
9
17
12
VCC = 5 V,
tsk(p)
Pulse skew ( | tdDL – tdDH | )
tt
Transition time (tr or tf)
† All typical values are at VCC = 5 V, TA = 25°C.
NOTE 2: This specification applies to any 5°C band within the operating temperature range.
POST OFFICE BOX 655303
TA = 25°C
MIN
• DALLAS, TEXAS 75265
See Note 2
8
6
10
UNIT
ns
ns
ns
ns
5
SN55LBC976
9-CHANNEL DIFFERENTIAL TRANSCEIVER
SGLS091A – JUNE 1995 – REVISED JANUARY 1997
receiver switching characteristics over recommended operating conditions (see Figure 5) (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
tpd
d
Propagation
g
delay
y time,, high-to-low-level
g
output ((tPHL) or
low-to-high-level output (tPLH)
VCC = 5 V,
TA = 25°C
tsk(lim)
k(li )
Skew limit,, the maximum difference in propagation
g
delay
y times
between any two drivers on any two devices
VCC = 5 V,
See Note 2
tsk(p
k( )
Pulse skew ( | tPHL – tPLH| )
MIN
TYP†
MAX
16
36
21
31
12
9
2
TA = – 55°C
tt
Transition time ( tr or tf )
† All typical values are at VCC = 5 V, TA = 25°C.
NOTE 2: This specification applies to any 5°C band within the operating temperature range.
UNIT
ns
ns
6
ns
10
ns
3
ns
transceiver switching characteristics over recommended operating conditions
MAX
UNIT
ten(RXL)
ten(RXH)
Enable time, transmit-to-receive to low-level output
PARAMETER
TEST CONDITIONS
MIN
180*
ns
Enable time, transmit-to-receive to high-level output
180*
ns
ten(TXL)
ten(TXH)
Enable time, receive-to-transmit to low-level output
110*
ns
110*
ns
See Figure 6
Enable time, receive-to-transmit to high-level output
tsu
Setup time, CDE0, CDE1, CDE2, BSR, or CRE to active input(s) or output(s)
* This parameter is not production tested.
180*
ns
thermal characteristics
PARAMETER
RθJA
Junction-to-free-air thermal resistance
RθJC
Junction-to-case thermal resistance
TEST CONDITIONS
Board mounted,
MIN
No air flow
PARAMETER MEASUREMENT INFORMATION
B+
A
– IIH
or
– IIL
VIH
or
VIL
B–
CDE0 at 5 V,
DE/RE at 5 V,
BSR at 0 V
Others Open
(see Note A)
VOD
VO,
VOH,
or
VOL
NOTE A: For the IOZ test, the BSR input is at 5 V and all others are at 0 V.
Figure 1. Driver Test Circuit and Input Conditions
6
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
– IOH,
– IOL,
– IOS,
or
– IOZ
TYP
MAX
UNIT
95.4
°C/ W
5.67
°C/ W
SN55LBC976
9-CHANNEL DIFFERENTIAL TRANSCEIVER
SGLS091A – JUNE 1995 – REVISED JANUARY 1997
PARAMETER MEASUREMENT INFORMATION
Vtest
R1 = 165 Ω
B+
0 V or 3 V
A
RL = 75 Ω
VOD
B–
CDE0 at 5 V,
DE/RE at 5 V,
BSR at 0 V,
Others Open
R2 = 165 Ω
Vtest
Figure 2. Driver VOD Test Circuit
CDE0, CDE1, CDE2,
CRE, and BSR at 0 V,
Others Open,
(see Note A)
– II,
– IIH,
or
– IIL
VI,
VIC,
VIH,
or
VIL
VIT + ,
VIT – ,
or
VID
B+
A
B–
VOH
or
VOL
– IOH,
– IOL,
or
– IOZ
NOTE A: For the IOZ measurement, BSR is at 5 V and CDE0, CDE1, and CDE2 are at 0 V.
Figure 3. Receiver Test Circuit and Input Conditions
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
7
SN55LBC976
9-CHANNEL DIFFERENTIAL TRANSCEIVER
SGLS091A – JUNE 1995 – REVISED JANUARY 1997
PARAMETER MEASUREMENT INFORMATION
GND
R1 = 165 Ω
B+
A
Input
(see Note A)
RL = 75 Ω
Output
B–
R2 = 165 Ω
CDE0 at 5 V,
DE/RE at 5 V,
BSR at 0 V,
Others Open
50 pF†
50 pF†
5V
† Includes probe and jig capacitance.
NOTE A: The input is provided by a pulse generator with an output of 0 V to 3 V, PRR of 1 MHz, 50% duty
cycle, tr and tf < 6 ns, and ZO = 50 Ω.
TEST CIRCUIT
3V
1.5 V
0V
Input
tdDH
Output
tdDL
90%
90%
10%
10%
tr
tf
VOLTAGE WAVEFORMS
Figure 4. Driver Test Circuit and Voltage Waveforms
8
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
0V
SN55LBC976
9-CHANNEL DIFFERENTIAL TRANSCEIVER
SGLS091A – JUNE 1995 – REVISED JANUARY 1997
PARAMETER MEASUREMENT INFORMATION
CDE0, CDE1, CDE2,
CRE, and BSR at 0 V,
All Others Open
Input
(see Note A)
B+
1.5 V
B–
A
15 pF†
Output
† Includes probe and jig capacitance.
NOTE A: The input is provided by a pulse generator with an output of 0 to 3 V, PRR of 1 MHz,
50% duty cycle, tr and tf < 6 ns, and ZO = 50 Ω.
TEST CIRCUIT
3V
1.5 V
0V
Input
tPLH
tPHL
90%
Output
90%
10%
tt
10%
VOH
1.4 V
VOL
tt
VOLTAGE WAVEFORMS
Figure 5. Receiver Test Circuit and Voltage Waveforms
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
9
SN55LBC976
9-CHANNEL DIFFERENTIAL TRANSCEIVER
SGLS091A – JUNE 1995 – REVISED JANUARY 1997
PARAMETER MEASUREMENT INFORMATION
0V3V
S1
0V
5V
S3
74HC241
R1
165 Ω
B+
A
50 pF†
B–
DE/RE
Input
(see Note A)
75 Ω
50 pF†
VOD
R2
165 Ω
CDE0 at 5 V,
CDE1, CDE2, BSR,
and CRE at 0 V,
All Others Open
5V
S2
0V
VA
† Includes probe and jig capacitance.
NOTE A: The input is provided by a pulse generator with an output of 0 V to 3 V, PRR of 1 MHz, 50% duty cycle, tr and tf < 6 ns,
and ZO = 50 Ω.
TEST CIRCUIT
3V
Input
1.5 V
1.5 V
0V
ten(RXL)
1.4 V
VA
S1 to 0 V
S2 to 5 V
S3 to 3 V
ten(TXH)
0V
VOD
3V
Input
1.5 V
1.5 V
0V
ten(RXH)
VA
1.4 V
S1 to 5 V
S2 to 0 V
S3 to 0 V
ten(TXL)
VOD
0V
VOLTAGE WAVEFORMS
Figure 6. Enable Time Test Circuit and Voltage Waveforms
10
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
SN55LBC976
9-CHANNEL DIFFERENTIAL TRANSCEIVER
SGLS091A – JUNE 1995 – REVISED JANUARY 1997
TYPICAL CHARACTERISTICS
INPUT CURRENT
vs
INPUT VOLTAGE
AVERAGE SUPPLY CURRENT
vs
FREQUENCY
0
400
I I – Input Current – µ A
100
40
9 Unloaded Receivers
10
4
1
0.001
VCC = 4.75 V
TA = 25°C
A, DE/RE, CRE, BSR
– 10
– 20
– 30
– 40
9 Unloaded Drivers
– 50
0.004 0.01
0.04
1
2
4
– 60
0
10
0.5
1
1.5
2
2.5
3
3.5
4
4.5
VI – Input Voltage – V
f – Frequency – MHz
Figure 7
Figure 8
INPUT CURRENT
vs
INPUT VOLTAGE
5
4
B+ and B –
3
I I – Input Current – mA
I CC – Average Supply Current – mA
1000
2
1
0
–1
–2
–3
–4
–5
– 20 – 16 – 12 – 8 – 4
0
4
8
12
16
20
VI – Input Voltage – V
Figure 9
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
11
SN55LBC976
9-CHANNEL DIFFERENTIAL TRANSCEIVER
SGLS091A – JUNE 1995 – REVISED JANUARY 1997
TYPICAL CHARACTERISTICS
DRIVER
DRIVER
LOW-LEVEL OUTPUT VOLTAGE
vs
LOW-LEVEL OUTPUT CURRENT
HIGH-LEVEL OUTPUT VOLTAGE
vs
HIGH-LEVEL OUTPUT CURRENT
2.1
5
VCC = 5 V
B+ and B –
B+ and B –
4.75
VOH – High-Level Output Voltage – mV
VOL – Low-Level Output Voltage – V
2
1.9
1.8
1.7
1.6
1.5
1.4
1.3
1.2
4.5
4.25
4
VCC = 5.25 V
3.75
VCC = 5 V
3.5
3.25
3
2.75
1.1
VCC = 4.75 V
2.5
0
10
20
30
40
50
70
60
80
90 100
0
– 10 – 20 – 30 – 40 – 50 – 60 – 70 – 80 – 90
IOL – Low-Level Output Current – mA
IOH – High-Level Output Current – mA
Figure 10
Figure 11
DRIVER
DIFFERENTIAL OUTPUT VOLTAGE
vs
OUTPUT CURRENT
VOD – Differential Output Voltage – V
5
TA = 25°C
4
3
VCC = 5 V
2
VCC = 5.25 V
1
VCC = 4.75 V
0
0
10
20
30
40
50
60
70
80
IO – Output Current – mA
Figure 12
12
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
90 100
SN55LBC976
9-CHANNEL DIFFERENTIAL TRANSCEIVER
SGLS091A – JUNE 1995 – REVISED JANUARY 1997
TYPICAL CHARACTERISTICS
DRIVER
DRIVER
LOW-LEVEL OUTPUT CURRENT
vs
SUPPLY VOLTAGE
HIGH-LEVEL OUTPUT CURRENT
vs
SUPPLY VOLTAGE
80
0
I OH – High-Level Output Current – mA
I OL – Low-Level Output Current – mA
B+ and B –
70
60
50
40
30
20
10
B+ and B –
– 10
– 20
– 30
– 40
– 50
– 60
– 70
0
2
2.5
3
3.5
4
4.5
5
– 80
5.5
2
2.5
VCC – Supply Voltage – V
Figure 13
3.5
4
4.5
5
RECEIVER
LOW-LEVEL OUTPUT VOLTAGE
vs
LOW-LEVEL OUTPUT CURRENT
VOL – Low-Level Output Voltage – 0.5 V/div
RECEIVER
HIGH-LEVEL OUTPUT VOLTAGE
vs
HIGH-LEVEL OUTPUT CURRENT
5
4.5
VCC = 5.25 V
4
VCC = 5 V
3.5
3
2.5
2
1.5
5.5
Figure 14
5.5
VOH – High-Level Output Voltage – V
3
VCC – Supply Voltage – V
VCC = 4.75 V
1
2
VCC = 5 V
VCC = 4.75 V
1.5
VCC = 5.25 V
1
0.5
0.5
0
0
0
– 10
– 20
– 30
– 40
– 50
– 60
– 70
IOH – High-Level Output Current – mA
0
10
20
30
40
50
60
IOL – Low-Level Output Current – mA
Figure 15
Figure 16
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
13
SN55LBC976
9-CHANNEL DIFFERENTIAL TRANSCEIVER
SGLS091A – JUNE 1995 – REVISED JANUARY 1997
TYPICAL CHARACTERISTICS
DRIVER
RECEIVER
DIFFERENTIAL OUTPUT VOLTAGE
vs
FREE-AIR TEMPERATURE
PROPAGATION DELAY TIME
vs
FREE-AIR TEMPERATURE
t PHL or t PLH – Propagation Delay Time – ns
1
VOD – Differential Output Voltage – V
B+ and B –
0.8
0.6
0.4
0.2
0
160
165
30
VCC = 4.75 V
VCC = 5.25 V
25
20
15
10
5
0
– 25
175
170
35
0
TA – Free-Air Temperature – °C
25
Figure 17
Figure 18
DRIVER
PROPAGATION DELAY TIME
vs
FREE-AIR TEMPERATURE
t PHL or t PLH – Propagation Delay Time – ns
25
20
VCC = 4.75 V
15
VCC = 5.25 V
10
5
0
– 25
0
25
50
75
TA – Free-Air Temperature – °C
Figure 19
14
50
75
TA – Free-Air Temperature – °C
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
100
100
SN55LBC976
9-CHANNEL DIFFERENTIAL TRANSCEIVER
SGLS091A – JUNE 1995 – REVISED JANUARY 1997
APPLICATION INFORMATION
Table 1. Typical Signal and Terminal Assignments
SCSI CONTROL
IPI DATA
CDE0
SIGNAL
TERMINAL
54
DIFFSENSE
SCSI DATA
DIFFSENSE
CDE1
55
GND
GND
VCC
XMTA, XMTB
VCC
GND
IPI CONTROL
CDE2
56
GND
GND
XMTA, XMTB
SLAVE/MASTER
BSR
2
GND
GND
GND, BSR
GND
CRE
3
GND
GND
GND
1A
4
DB0, DB8
ATN
AD7, BD7
VCC
NOT USED
1DE/RE
5
DBE0, DBE8
INIT EN
GND
GND
2A
6
DB1, DB9
BSY
AD6, BD6
NOT USED
2DE/RE
7
DBE1, DBE9
BSY EN
GND
GND
3A
8
DB2, DB10
ACK
AD5, BD5
SYNC IN
9
3DE/RE
DBE2, DBE10
INIT EN
GND
GND
10
DB3, DB11
RST
AD4, BD4
SLAVE IN
4DE/RE
11
DBE3, DBE11
GND
GND
GND
5A
19
DB4, DB12
MSG
AD3, BD3
NOT USED
5DE/RE
20
DBE4, DBE12
TARG EN
GND
GND
6A
21
DB5, DB13
SEL
AD2, BD2
SYNC OUT
6DE/RE
22
DBE5, DBE13
SEL EN
GND
GND
7A
23
DB6, DB14
C/D
AD1, BD1
MASTER OUT
7DE/RE
24
DBE6, DBE14
TARG EN
GND
GND
8A
25
DB7, DB15
REQ
AD0, BD0
SELECT OUT
8DE/RE
26
DBE7, DBE15
TARG EN
GND
GND
9A
27
DBP0, DBP1
I/O
AP, BP
ATTENTION IN
9DE/RE
28
DBPE0, DBPE1
TARG EN
XMTA, XMTB
VCC
4A
ABBREVIATIONS:
DBn, data bit n, where n = (0,1, . . . ,15)
DBEn, data bit n enable, where n = (0,1, . . . ,15)
DBP0, parity bit for data bits 0 through 7 or IPI bus A
DBPE0, parity bit enable for P0
DBP1, parity bit for data bits 8 through 15 or IPI bus B
DBPE1, parity bit enable for P1
ADn or BDn, IPI Bus A – Bit n (ADn) or Bus B – Bit n (BDn), where n = (0,1, . . . ,7)
AP or BP, IPI parity bit for bus A or bus B
XMTA or XMTB, transmit enable for IPI bus A or B
BSR, bit significant response
INIT EN, common enable for SCSI initiator mode
TARG EN, common enable for SCSI target mode
NOTE 3: Signal inputs are shown as active high. When only active-low inputs are available, logic
inversion is accomplished by reversing the B + and B – connecter terminal assignments.
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
15
SN55LBC976
9-CHANNEL DIFFERENTIAL TRANSCEIVER
SGLS091A – JUNE 1995 – REVISED JANUARY 1997
APPLICATION INFORMATION
Function Tables
RECEIVER
DRIVER
B+
A
B+
A
B–
INPUTS
B +†
B –†
L
H
B–
OUTPUT
A
INPUT
A
L
H
L
H
H
L
TRANSCEIVER
OUTPUTS
B+
B–
L
H
H
L
DRIVER WITH ENABLE
B+
A
B+
B–
A
DE/RE
B–
DE/RE
DE/RE
L
L
H
H
INPUTS
A B +†
–
–
L
H
L
H
–
–
B –†
A
H
L
–
–
L
H
–
–
INPUTS
DE/RE
A
OUTPUTS
B–
B+
–
–
L
H
L
L
H
H
–
–
H
L
WIRED-OR DRIVER
L
H
L
H
OUTPUTS
B–
B+
Z
Z
L
H
Z
Z
H
L
TWO-ENABLE INPUT DRIVER
B+
A
A
B–
B+
B–
DE/RE
INPUT
A
L
H
INPUTS
DE/RE A
OUTPUTS
B+
B–
Z
H
L
L
H
H
Z
L
L
H
L
H
OUTPUTS
B–
B+
Z
H
L
H
Z
L
H
L
H = high level, L = low level, X = irrelevant, Z = high impedance (off)
† An H in this column represents a voltage that is 200 mV higher than the other bus input. An L represents a voltage that is 200 mV lower than
the other bus input. Any voltage less than 200 mV results in an indeterminate receiver output.
16
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
SN55LBC976
9-CHANNEL DIFFERENTIAL TRANSCEIVER
SGLS091A – JUNE 1995 – REVISED JANUARY 1997
APPLICATION INFORMATION
VCC
VCC
SCSI
Connector
560 Ω †
nB +
nB +
nA
I/O
+
nB –
nA
I/O
+
nDE/RE
nDE/RE
(a) ACTIVE-HIGH BIDIRECTIONAL I/O
WITH SEPARATE ENABLE
VCC
SCSI
Connector
560 Ω
nB +
nA
–
VCC
SCSI
Connector
–
SCSI
Connector
560 Ω †
nB+
–
nB –
+
nDE/RE
nB +
nA
nB –
(d) SEPARATE ACTIVE-HIGH INPUT, OUTPUT,
AND ENABLE
VCC
+
EN
nA
EN
(c) WIRED-OR DRIVER AND ACTIVE-HIGH INPUT
I
O‡
nB +
I
‡
O
nDE/RE
560 Ω
SCSI
Connector
560 Ω
+
nB –
I
O
(b) ACTIVE-LOW BIDIRECTIONAL I/O
WITH SEPARATE ENABLE
VCC
VCC
560 Ω †
–
nB –
–
EN
EN
SCSI
Connector
560 Ω †
nA
I
O
nDE/RE
nB –
–
+
nDE/RE
560 Ω
(e) SEPARATE ACTIVE-LOW INPUT AND
OUTPUT AND ACTIVE-HIGH ENABLE
(f) WIRED-OR DRIVER AND ACTIVE-LOW INPUT
† When this resistor is 0 Ω, the circuit is open drain.
‡ Must be open-drain or 3-state output
NOTE A: The BSR, CRE, A, and DE/RE inputs have internal pullups. CDE0, CDE1, and CDE2 have internal pulldowns.
Figure 20. Typical SCSI Transceiver Connections
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
17
SN55LBC976
9-CHANNEL DIFFERENTIAL TRANSCEIVER
SGLS091A – JUNE 1995 – REVISED JANUARY 1997
APPLICATION INFORMATION
channel logic configurations with control input logic
The following logic diagrams show the positive-logic representation for all combinations of control inputs. The
control inputs are from MSB to LSB; the BSR, CDE0, CDE1, CDE2, and CRE bit values are shown below the
diagrams. Channel 1 is at the top of the logic diagrams; channel 9 is at the bottom of the logic diagrams.
Hi-Z
Hi-Z
Hi-Z
Hi-Z
Hi-Z
Figure 21. 00000
18
Hi-Z
Figure 22. 00001
Figure 23. 00010
POST OFFICE BOX 655303
Figure 24. 00011
• DALLAS, TEXAS 75265
Figure 25. 00100
SN55LBC976
9-CHANNEL DIFFERENTIAL TRANSCEIVER
SGLS091A – JUNE 1995 – REVISED JANUARY 1997
APPLICATION INFORMATION
Hi-Z
Hi-Z
Hi-Z
Hi-Z
Hi-Z
Figure 26. 00101
Hi-Z
Figure 27. 00110
Figure 28. 00111
Figure 30. 01001
Figure 29. 01000
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
19
SN55LBC976
9-CHANNEL DIFFERENTIAL TRANSCEIVER
SGLS091A – JUNE 1995 – REVISED JANUARY 1997
APPLICATION INFORMATION
Figure 34. 01101
Figure 31. 01010
20
Figure 32. 01011
Figure 33. 01100
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
Figure 35. 01110
SN55LBC976
9-CHANNEL DIFFERENTIAL TRANSCEIVER
SGLS091A – JUNE 1995 – REVISED JANUARY 1997
APPLICATION INFORMATION
Hi-Z
Hi-Z
Hi-Z
Hi-Z
Hi-Z
Hi-Z
Hi-Z
Hi-Z
Hi-Z
Hi-Z
Hi-Z
Hi-Z
Hi-Z
Figure 36. 01111
Figure 37.
10000
and 10001
Hi-Z
Hi-Z
Hi-Z
Hi-Z
Hi-Z
Hi-Z
Figure 38. 10010
and 10011
Figure 39. 10100
and 10101
Hi-Z
Figure 40. 10110
and 10111
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
21
SN55LBC976
9-CHANNEL DIFFERENTIAL TRANSCEIVER
SGLS091A – JUNE 1995 – REVISED JANUARY 1997
APPLICATION INFORMATION
Hi-Z
Figure 41. 11000
and 11001
Hi-Z
Figure 42. 11010
and 11011
Hi-Z
Figure 43. 11100
and 11101
Hi-Z
Figure 44. 11110
and 11111
22
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
SN55LBC976
9-CHANNEL DIFFERENTIAL TRANSCEIVER
SGLS091A – JUNE 1995 – REVISED JANUARY 1997
MECHANICAL INFORMATION
WD (R-GDFP-F**)
CERAMIC DUAL FLATPACK
48 PIN SHOWN
NO. OF
PINS**
0.120 (3,05)
0.075 (1,91)
A
MIN
MAX
48
0.630
(16,00)
0.730
(18,54)
56
0.610
(15,49)
0.710
(18,03)
0.005 (0,13) NOM
1.200 (30,50)
0.950 (24,13)
0.390 (9,91)
0.370 (9,40)
1
48
0.025 (0,64)
A
0.010 (0,25) TYP
24
25
4040176 / B 03/95
NOTES: A.
B.
C.
D.
E.
All linear dimensions are in inches (millimeters).
This drawing is subject to change without notice.
This package can be hermetically sealed with a ceramic lid using glass frit.
Index point is provided on cap for pin identification only
Falls within MIL-STD-1835: GDFP1-F48 and JEDEC MO -146AA
GDFP1-F56 and JEDEC MO -146AB
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
23
PACKAGE OPTION ADDENDUM
www.ti.com
18-Sep-2008
PACKAGING INFORMATION
Orderable Device
Status (1)
Package
Type
Package
Drawing
SNJ55LBC976WD
OBSOLETE
CFP
WD
Pins Package Eco Plan (2)
Qty
56
TBD
Lead/Ball Finish
Call TI
MSL Peak Temp (3)
Call TI
(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 - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check
http://www.ti.com/productcontent for the latest availability information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined.
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.
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and
package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS
compatible) as defined above.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame
retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material)
(3)
MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry 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.
OTHER QUALIFIED VERSIONS OF SN55LBC976 :
• Catalog: SN75LBC976
NOTE: Qualified Version Definitions:
• Catalog - TI's standard catalog product
Addendum-Page 1
IMPORTANT NOTICE
Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements,
and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should
obtain the latest relevant information before placing orders and should verify that such information is current and complete. All products are
sold subject to TI’s terms and conditions of sale supplied at the time of order acknowledgment.
TI warrants performance of its hardware products to the specifications applicable at the time of sale in accordance with TI’s standard
warranty. Testing and other quality control techniques are used to the extent TI deems necessary to support this warranty. Except where
mandated by government requirements, testing of all parameters of each product is not necessarily performed.
TI assumes no liability for applications assistance or customer product design. Customers are responsible for their products and
applications using TI components. To minimize the risks associated with customer products and applications, customers should provide
adequate design and operating safeguards.
TI does not warrant or represent that any license, either express or implied, is granted under any TI patent right, copyright, mask work right,
or other TI intellectual property right relating to any combination, machine, or process in which TI products or services are used. Information
published by TI regarding third-party products or services does not constitute a license from TI to use such products or services or a
warranty or endorsement thereof. Use of such information may require a license from a third party under the patents or other intellectual
property of the third party, or a license from TI under the patents or other intellectual property of TI.
Reproduction of TI information in TI data books or data sheets is permissible only if reproduction is without alteration and is accompanied
by all associated warranties, conditions, limitations, and notices. Reproduction of this information with alteration is an unfair and deceptive
business practice. TI is not responsible or liable for such altered documentation. Information of third parties may be subject to additional
restrictions.
Resale of TI products or services with statements different from or beyond the parameters stated by TI for that product or service voids all
express and any implied warranties for the associated TI product or service and is an unfair and deceptive business practice. TI is not
responsible or liable for any such statements.
TI products are not authorized for use in safety-critical applications (such as life support) where a failure of the TI product would reasonably
be expected to cause severe personal injury or death, unless officers of the parties have executed an agreement specifically governing
such use. Buyers represent that they have all necessary expertise in the safety and regulatory ramifications of their applications, and
acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products
and any use of TI products in such safety-critical applications, notwithstanding any applications-related information or support that may be
provided by TI. Further, Buyers must fully indemnify TI and its representatives against any damages arising out of the use of TI products in
such safety-critical applications.
TI products are neither designed nor intended for use in military/aerospace applications or environments unless the TI products are
specifically designated by TI as military-grade or "enhanced plastic." Only products designated by TI as military-grade meet military
specifications. Buyers acknowledge and agree that any such use of TI products which TI has not designated as military-grade is solely at
the Buyer's risk, and that they are solely responsible for compliance with all legal and regulatory requirements in connection with such use.
TI products are neither designed nor intended for use in automotive applications or environments unless the specific TI products are
designated by TI as compliant with ISO/TS 16949 requirements. Buyers acknowledge and agree that, if they use any non-designated
products in automotive applications, TI will not be responsible for any failure to meet such requirements.
Following are URLs where you can obtain information on other Texas Instruments products and application solutions:
Products
Amplifiers
Data Converters
DSP
Clocks and Timers
Interface
Logic
Power Mgmt
Microcontrollers
RFID
RF/IF and ZigBee® Solutions
amplifier.ti.com
dataconverter.ti.com
dsp.ti.com
www.ti.com/clocks
interface.ti.com
logic.ti.com
power.ti.com
microcontroller.ti.com
www.ti-rfid.com
www.ti.com/lprf
Applications
Audio
Automotive
Broadband
Digital Control
Medical
Military
Optical Networking
Security
Telephony
Video & Imaging
Wireless
www.ti.com/audio
www.ti.com/automotive
www.ti.com/broadband
www.ti.com/digitalcontrol
www.ti.com/medical
www.ti.com/military
www.ti.com/opticalnetwork
www.ti.com/security
www.ti.com/telephony
www.ti.com/video
www.ti.com/wireless
Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265
Copyright © 2008, Texas Instruments Incorporated