Panasonic AN8612NSB Datasheet

ICs for Information Equipment

AN8612NSB

SCSI active terminator IC

■ Overview

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-I I specification due to its small
output pin capacitance. It can sapport 10 Mbyte/s of
SCSI-II and 20 Mbyte/s of FAST-20.

■ Features

• Active termination for 18-signal line

• Low power consumption due to its standby func-
tion (100 µA at standby).

• Small output pin capacitance: 3.8 pF (typ.)

• High precision regulator: 2.85 V±60 mV

■ Applications

• SCSI interface board of PC

• SCSI-compatible equipment such as CD-ROM,

MO, PD, MD drive and printer

12.63±0.20

24 19 18 13

167

(0.715) (3.20)

0.80

(1.90)

12

+0.10

0.30

–0.05

HSOP030-P-0300

7.60±0.30

5.50±0.20

–0.05

+0.10

0.20

0.10±0.10 2.00±0.20

Seating plane

Unit: mm

(1.05)

0° to 10°

0.50±0.20

1

AN8612NSB ICs for Information Equipment

■ Block Diagram

24

12

2.85 V

REG out

TERMPWR

Standby

13

115 Ω
115 Ω
115 Ω

Thermal

shut down

Band gap
reference

1

115 Ω
115 Ω
115 Ω
115 Ω
115 Ω
115 Ω
115 Ω
115 Ω
115 Ω
115 Ω
115 Ω
115 Ω
115 Ω
115 Ω
115 Ω

18

17

16

15

14

11

10

9

8

7

5

4

3

2

23

22

21

20

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

6

19

GND

GND

2

ICs for Information Equipment AN8612NSB

■ Pin Descriptions

Pin No. Description

1

1 Standby

*

2 SG line14
3 SG line13
4 SG line12
5 SG line11

2

6 GND

Fin GND

*

2

*

7 SG line10
8 SG line9

9 SG line8
10 SG line7
11 SG line6

3

12 VCC (TERMPWR)

Note)*1: A standby pin input voltage becomes an active mode at VI < VTH and a standby mode at VI > V

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).

*

*

Pin No. Description

3

13 VCC (TERMPWR)

*

14 SG line5
15 SG line4
16 SG line3
17 SG line2
18 SG line1

2

Fin GND

19 GND

*

2

*

20 SG line18
21 SG line17
22 SG line16
23 SG line15
24 REG out

.

TH+

■ Absolute Maximum Ratings

Parameter Symbol Rating Unit

Supply voltage V
Supply current I

2

Power dissipation
Operating ambient temperature
Storage temperature

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".

*

1

*

1

*

CC

CC

P

D

T

opr

T

stg

6.0 V
550 mA
412 mW

−20 to +75 °C

−55 to +150 °C

■ Recommended Operating Range

Parameter Symbol Range Unit

Supply voltage V

CC

4.0 to 5.5 V

3