3

AT88SC0104C

2021GS–SMEM–7/06

grammed into the 64-bit answer-to-reset register. An internal pull-up on the RST input

pad allows the device to be used in synchronous mode without bonding RST. The

AT88SC0104C does not support the synchronous answer-to-reset sequence.

Serial Data (SDA/IO)

The SDA pin is bidirectional for serial data transfer. This pin is open-drain driven and

may be wired with any number of other open drain or open collector devices. An exter-

nal pull-up resistor should be connected between SDA and V

resistor and the system capacitance loading the SDA bus will determine the rise time of

SDA. This rise time will determine the maximum frequency during read operations. Low

value pull-up resistors will allow higher frequency operations while drawing higher aver-

age power supply current. SDA/IO information applies to both asynchronous and

synchronous protocols.

When the synchronous protocol is used, the SCL/CLK input is used to positive edge

clock data into the device and negative edge clock data out of the device.

Table 2. DC Characteristics

Symbol

Parameter

Test Condition

Min

Typ

Max

Units

V

CC

Supply Voltage

2.7

5.5

V

I

CC

Supply Current (V

Async READ at 3.57MHz

5

mA

Async WRITE at 3.57MHz

5

mA

I

CC

Supply Current (V

Synch READ at 1MHz

5

mA

Synch WRITE at 1MHz

5

mA

I

SB

Standby Current (V

V

100

uA

0

V

V

IL

0

V

V

0

V

V

IH

V

V

CC

V

V

V

IH

V

V

CC

V

SDA/IO Input Low Current

15

uA

I

IL

SCL/CLK Input Low Current

0 < V

15

uA

RST Input Low Current

50

uA

I

IH

SDA/IO Input High Current

V

20

uA

I

IH

SCL/CLK Input High Current

V

100

uA

RST Input High Current

150

uA

V

OH

SDA/IO Output High Voltage

20K ohm external pull-up

V

V

CC

V

SDA/IO Output Low Voltage

0

V

SDA/IO Output High Current

VOH

20

uA

Note:

1. V