PANASONIC AN8612NSB

ICs for Information Equipment
AN8612NSB
SCSI active terminator IC
■ Overview
Unit: mm
12.63±0.20
(1.90)
• Active termination for 18-signal line
• Low power consumption due to its standby function (100 µA at standby).
• Small output pin capacitance: 3.8 pF (typ.)
• High precision regulator: 2.85 V±60 mV
19
18
13
1
6
7
12
(0.715)
(3.20)
0.80
+0.10
0.30–0.05
+0.10
0.20 –0.05
2.00±0.20
(1.05)
0.10±0.10
■ Features
24
5.50±0.20
7.60±0.30
The AN8612NSB is a terminator IC conformed
to standard interface specification (SCSI-I/II) for
personal computers, workstations and various types
of information equipment. So far configured with
a fixed resistor and a regulator, it has recently been
integrated onto a single chip with built-in standby
function.
It is easy to satisfy 25 pF of the maximum pin
capacitance in SCSI-II specification due to its small
output pin capacitance. It can sapport 10 Mbyte/s of
SCSI-II and 20 Mbyte/s of FAST-20.
0° to 10°
0.50±0.20
Seating plane
HSOP030-P-0300
■ Applications
• SCSI interface board of PC
• SCSI-compatible equipment such as CD-ROM,
MO, PD, MD drive and printer
1
AN8612NSB
ICs for Information Equipment
■ Block Diagram
24
12
TERMPWR
2.85 V
115 Ω 18
13
115 Ω 17
115 Ω 16
Thermal
shut down
115 Ω 15
115 Ω 14
115 Ω 11
115 Ω 10
Band gap
reference
115 Ω
115 Ω
115 Ω
115 Ω
115 Ω
115 Ω
115 Ω
9
8
7
5
4
3
2
115 Ω 23
115 Ω 22
115 Ω 21
115 Ω 20
GND
GND
2
19
1
6
Standby
REG out
SG line1
SG line2
SG line3
SG line4
SG line5
SG line6
SG line7
SG line8
SG line9
SG line10
SG line11
SG line12
SG line13
SG line14
SG line15
SG line16
SG line17
SG line18
ICs for Information Equipment
AN8612NSB
■ Pin Descriptions
Pin No.
Description
Pin No.
Description
13
VCC (TERMPWR) *3
SG line14
14
SG line5
3
SG line13
15
SG line4
4
SG line12
16
SG line3
5
SG line11
1
Standby
2
6
Fin
*1
17
SG line2
GND
*2
18
SG line1
GND
*2
Fin
GND *2
7
SG line10
19
GND *2
8
SG line9
20
SG line18
9
SG line8
21
SG line17
10
SG line7
22
SG line16
11
SG line6
23
SG line15
24
REG out
12
VCC (TERMPWR)
*3
Note) *1: A standby pin input voltage becomes an active mode at VI < VTH and a standby mode at VI > VTH+ .
Likewise, a standby mode when standby pin is open.
*2: Both ground pins of the pin 6 and pin 19 should be placed on the same pattern, and the pattern should be wide on the PCB.
(We recommend that whole surface of one layer of a multi-layer PCB be GND.)
*3: Connect the VCC to SCSI termination resistor power supply (TERMPWR).
■ Absolute Maximum Ratings
Parameter
Supply voltage
Supply current
Power dissipation
*2
Operating ambient temperature
Storage temperature
*1
*1
Symbol
Rating
Unit
VCC
6.0
V
ICC
550
mA
PD
412
mW
Topr
−20 to +75
°C
Tstg
−55 to +150
°C
Note) *1: Except for the power dissipation, operating ambient temperature and storage temperature, all ratings are for Ta = 25°C.
*2: Ta = 75°C. For the independent IC without a heat sink.
Refer to "■ Application Notes".
■ Recommended Operating Range
Parameter
Supply voltage
Symbol
Range
Unit
VCC
4.0 to 5.5
V
3
AN8612NSB
ICs for Information Equipment
■ Electrical Characteristics at VCC = 5.0 V, Ta = 25°C
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
Supply current 1
ICC1
Standby = low, all SG line = open

44
54
mA
Supply current 2
ICC2
Standby = low, All SG line = 0.2 V

458
530
mA
Supply current 3
ICC3
Standby = open

100
200
µA
−150
−50

µA


1
µA
Standby pin low-level input
current
ISTBYL
VCC = 5.5 V, VI = 0 V
Standby pin high-level input
current
ISTBYH
VCC = 5.5 V, VI = 5.5 V
Standby pin positive direction
threshold voltage
VTH+
1.3
1.5
1.7
V
Standby pin negative direction
threshold voltage
VTH−
1.1
1.3
1.5
V
19.8
23.0
26.2
mA
Maximum output current
SG line1 to SG line18
ISG
VSG = 0.2 V
Output leak current 1
SG line1 to SG line18
ILK1
VCC = 5.5 V
Standby = open, VSG = 0 V
−1


µA
Output leak current 2
SG line1 to SG line18
ILK2
VCC = 5.5 V, VSG = 2.85 V
Standby = open
−1

1
µA
REG output voltage 1
VREG1
VCC = 4.0 V to 5.5 V, all SG line = open
2.79
2.85
2.91
V
REG output voltage 2
VREG2
VCC = 3.2 V, all SG line = open
2.00


V
Termination resistance value
SG line1 to SG line18
RSG
ISG = 5 mA to 15 mA
107
115
123
Ω
High-level output voltage
SG line1 to SG line18
VSGH
VCC = 4.0 V to 5.5 V, all SG line = open
2.78
2.85
2.92
V
• Design reference data
Note) The characteristics listed below are theoretical values based on the IC design and are not guaranteed.
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
Standby pin hysteresis width
VHYS

200

mV
Output pin capacitance
CSG

3.8
4.5
pF
Thermal shutdown temperature
TTSD

170

°C
■ Terminal Equivalent Circuits
Pin No.
1
Symbol
Equivalent circuit
Standby
VCC
100 kΩ
1
GND
4
ICs for Information Equipment
AN8612NSB
■ Terminal Equivalent Circuits (continued)
Pin No.
2
3
4
5
Symbol
Pin 2: SG line14
Pin 3: SG line13
Pin 4: SG line12
Pin 5: SG line11
Equivalent circuit
VCC
115 Ω
REG out
Pin 2
3
4
5
Standby
GND
6
GND

Fin
GND

7
8
9
10
11
Pin 7: SG line10
Pin 8: SG line9
Pin 9: SG line8
Pin 10: SG line7
Pin 11: SG line6
VCC
115 Ω
REG out
Pin 7
8
9
10
11
Standby
GND
12
13
Pin 12: VCC (TERMPWR)
Pin 13: VCC (TERMPWR)
12
13
GND
14
15
16
17
18
Pin 14: SG line5
Pin 15: SG line4
Pin 16: SG line3
Pin 17: SG line2
Pin 18: SG line1
VCC
115 Ω
REG out
Standby
GND
Pin 14
15
16
17
18
5
AN8612NSB
ICs for Information Equipment
■ Terminal Equivalent Circuits (continued)
Pin No.
Symbol
Equivalent circuit
Fin
GND

19
GND

20
21
22
23
Pin 20: SG line18
Pin 21: SG line17
Pin 22: SG line16
Pin 23: SG line15
VCC
115 Ω
REG out
Pin 20
21
22
23
Standby
GND
24
REG out
VCC
24
20 kΩ
Standby
GND
■ Application Notes
• PD  Ta curves of HSOP030-P-0300
PD  T a
1400
1344
Rth(j-C) = 29.5°C/W
Power dissipation PD (W)
1200
Mounted on standard board
(glass epoxy:
50 mm × 50 mm × t0.8 mm)
Rth(j-a) = 93°C/W
PD = 1 344 mW (25°C)
1000
800
686
600
Independent IC
without a heat shink
Rth(j-a) = 182°C/W
PD = 686 mW (25°C)
400
200
0
0
25
50
75
100
Ambient temperature Ta (°C)
6
125
150
Terminator: Active
GND
REG out
AN8612NSB
Standby
VCC
SG line18
···············
SG line1
TERMPWR
SCSI equipment
SCSI
cable
Terminator: Standby
GND
REG out
AN8612NSB
Standby
VCC
SG line18
···············
SG line1
TERMPWR
SCSI equipment
SCSI
cable
Terminator: Active
GND
REG out
AN8612NSB
Standby
VCC
SG line18
···············
SG line1
TERMPWR
SCSI equipment
ICs for Information Equipment
AN8612NSB
■ Application Circuit Example
7