AT88SC0808C_14 Datasheet, PDF (3/21 Pages) ATMEL Corporation – Atmel CryptoMemory, 8-Kbit

Figure 1-1. Block Diagram
V_CC
GND
Power
Management
SCL/CLK
SDA/IO
RST
Synchronous
Interface
Asynchronous
ISO Interface
Reset Block
Authentication,
Encryption and
Certification Unit
Data Transfer
Password
Verification
Answer to Reset
Random
Generator
EEPROM
2. Pin Descriptions
2.1 Supply Voltage (V_CC)
The VCC input is a 2.7V to 5.5V positive voltage supplied by the host.
2.2 Clock (SCL/CLK)
In the asynchronous T = 0 protocol, the SCL/CLK input is used to provide the device with a carrier frequency f. The nominal
length of one bit emitted on I/O is defined as an “elementary time unit” (ETU) and is equal to 372/f. 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.
2.3 Reset (RST)
The AT88SC0808C provides an ISO 7816-3 compliant asynchronous answer to reset sequence. When the reset sequence is
activated, the device will output the data programmed 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 AT88SC0808C does not support the
synchronous answer-to-reset sequence
2.4 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 external pull-up resistor should be connected between SDA and VCC. The value of
this 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 average power. 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.
AT88SC0808C [SUMMARY DATASHEET]
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Atmel-2024MS-CryptoMem-AT88SC0808C-Datasheet-Summary_122013