M35B32 datasheet(8/44 Pages) STMICROELECTRONICS

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Signal description

M35B32

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DocID18391 Rev 4

Signal description

During all operations, VCC must be held stable and within the specified valid range:

VCC(min) to VCC(max).

All of the input and output signals must be held high or low (according to voltages of VIH,

VOH, VIL or VOL, as specified in Table 10). These signals are described below.

2.1

Serial Data output (Q)

This output signal is used to transfer data serially out of the device. Data is shifted out on the

falling edge of Serial Clock (C).

2.2

Serial Data input (D)

This input signal is used to transfer data serially into the device. It receives instructions,

addresses, and the data to be programmed. Values are latched on the rising edge of Serial

Clock (C).

2.3

Serial Clock (C)

This input signal provides the timing of the serial interface. Instructions, addresses, or data

present at Serial Data Input (D) are latched on the rising edge of Serial Clock (C). Data on

Serial Data Output (Q) changes after the falling edge of Serial Clock (C).

2.4

Chip Select (S)

When this input signal is high, the device is deselected and Serial Data Output (Q) is at high

impedance. Unless an internal Read, Program, Erase or Write cycle is in progress, the

device will be in the Standby Power mode (this is not the Deep Power-down mode). Driving

Chip Select (S) low selects the device, placing it in the Active Power mode.

After Power-up, a falling edge on Chip Select (S) is required prior to the start of any

instruction.

2.5

Reset (RESET)

The Reset (RESET) input provides a hardware reset for the memory. In this mode, the

device is in Standby mode, the WEL and WIP bits are reset (to 0) and the outputs are high

impedance.

When Reset (RESET) is driven high, the memory is in the normal operating mode. When

Reset (RESET) is driven low, the memory will enter the Reset mode(c).

c. If the M35A32 is executing a Write (pr program) cycle), the RESET pin driven active (low) does not stop an on

going Program or Write cycle.

M35B32 Datasheet(PDF) 8 Page - STMicroelectronics