at88sc018 ATMEL Corporation, at88sc018 Datasheet - Page 4

• Manufacturer Part Number: at88sc018
• Description: Cryptocompanion? Chip For Cryptomemory And Cryptorf
• Manufacturer: ATMEL Corporation

1.4.2. Package
1.4.3. Connection Diagram
4
1.4.1.3. SCL
Two wire interface clock pin, 5 V compatible. Maximum SCL rate is 400KHz, min. T
The system board must include an external pull-up resistor.
1.4.1.4. Reset (RST)
This active low input will reset all states within the AT88SC018. It is honored regardless of the state of PowerDown.
1.4.1.5. PowerDown(PDN)
When held low, the part operates normally. When held high the part will go to sleep and ignore all transitions on SDA
and SCL, power consumption will drop to less than 10 μA. There is a 50 ms delay between this pin falling and the first
transition on SDA or SCL that will be accepted by the chip.
The AT88SC018 is packaged in an 8 lead SOIC package, pinout is as follows:
Table 1.
Pins 2 & 6 are not internally connected and should be connected to ground on the PC board.
Figure 1.
CryptoCompanion Chip
Pin Number
Microprocessor
2,6
1
5
7
8
4
3
Connection Diagram
8 lead SOIC package pinout
Pin Name
GND
SDA
PDN
SCL
RST
V
NC
2.7v - 5.5v
CC
SDA
SCL
CryptoCompanion
2.7v - 3.6v
LOW
= 1.2 μs, min. T
5277C–CryptoCompanion–9/09
HIGH
= 0.6 μs.