CH224ATF 查看數據表（PDF） - Cermetek Microelectronics

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CH224ATF

Complete 2400 bps Modem Module

Cermetek Microelectronics 

Cermetek Microelectronics, Inc.

CH224ATF Complete 2400 bps Modem Module

Mode

Serial TTL

Normal mode

Sleep mode

Notes:

Table 12. Current and Power Requirements

Current (ID)

Typical

Maximum

Typical

Current

Current

Power

@25°C

@0°C

@25°C

31mA

7 mA

33 mA

9 mA

155 mW

35 mW

1. Test conditions: 5.0 VDC for typical values; VDD = 5.25 for maximum values.

Power (PD)

Maximum Power

@0°C

165 mW

45 mW

Table 13. Absolute Maximum Ratings

Parameter

Symbol

Limits

Supply Voltage

VDD

-0.5 to +6.0

V

Input Voltage

VIN

-0.5 to (+5VD +0.5) V

Analog Inputs

VIN

-0.3 to (+5VA +0.3) V

Voltage Applied to Outputs in High Z State VDD

-0.5 to (+5VD +0.5) V

DC Input Clam Current

IIK

+20

MA

DC Output Clamp Current

IOK

+20

MA

Static Discharge Voltage (@25°C)

VESD

+2500

V

Latch-Up Current (@25°C)

ITRIG

+400

mA

Operating Temperature Range

TA

-0 to +70

°C

Storage Temperature Range

TSTG

-40 to +80

°C

Units

PHONE LINE CONNECTION GUIDELINES

1. The CH224ATF must be mounted in the

final assembly such that it is isolated from

exposure to any hazardous voltages within

the assembly. Adequate separation and

restraint of cables and cords must be

provided.

2. The circuitry from the CH224ATF to the

telephone line interface must be provided

in wiring that carries no other circuitry

other than that specifically allowed in the

FCC rules (such as A and A1 leads).

3. Connection to phone line should be made

through an RJ-11C jack.

4. PCB traces from the modem’s RING and

TIP pins to the RJ-11C jack must be 0.1

inch spacing or greater to one another and

0.2 inch spacing or greater to all other

traces. The traces should have a nominal

width of 0.020 inches or greater.

5. The RING and TIP PCB traces should be

as short as possible and oriented to

prevent coupling other high speed or high

frequency signals present on the host

circuit PCB.

6. No additional circuitry other than that

shown in Figure 7A or 7B may be

connected between the modem module

and the RJ-11C jack. Doing so will

invalidate the FCC approval.

7. The CH224ATF requires external surge

protection (see Figure 7). This is mandatory

to maintain FCC Part 68 conveyed approval.

8. The CH224ATF, the RJ-11C jack, the

interfacing circuitry and all PCB traces in

between, must be contained on a PCB with a

94 V-0 flammability rating.

9. The supplied FCC registration label must be

applied visibly on the outside of the product.

10.The product ’s User Manual must provide the

user with instructions for connection and use

as recommended in the FCC Registration

Section below.

FCC REGISTRATION

All products in the CH224ATF series are

registered with the FCC (Federal

Communications Commission) under Part 68. To

maintain the validity of the registration, you must

serve notice to the end user of the product of

several restrictions the FCC places on the

modem and its use.

The CH224ATF requires external surge

protection (see Figure 7). This is mandatory to

maintain FCC Part 68 conveyed approval. Refer

to Cermetek Application Note #126 for more

details.

2001 Cermetek Microelectronics, Inc.

Page 10

Document No. 607-0005 Revision B1 (05/02)

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