BQ4011YMA-70N

Series:	--
Packaging:	Tray
Part Status:	Obsolete
Memory Type:	Non-Volatile
Memory Format:	NVSRAM
Technology:	NVSRAM (Non-Volatile SRAM)
Memory Size:	256Kb (32K x 8)
Write Cycle Time - Word, Page:	70ns
Access Time:	70ns
Memory Interface:	Parallel
Voltage - Supply:	4.5 V ~ 5.5 V
Operating Temperature:	-40°C ~ 85°C (TA)
Mounting Type:	Through Hole
Package / Case:	28-DIP Module (0.61", 15.49mm)
Supplier Device Package:	28-DIP Module (18.42x37.72)
Base Part Number:	BQ4011

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BQ4011YMA-70N Memory

The BQ4011YMA-70N is an integrated Li-Ion secondary protection device on the smart card market that relies on a unique Memory circuit. The combination of memory, E2prom and watchdog make it an ideal choice for protecting smart cards with rechargeable Li-Ion batteries. It is also suitable for high-end secure cards such as SIM cards and IC cards.

Application Field

The BQ4011YMA-70N Memory device is used for a range of applications in which good protection of Li-Ion battery is required, such as in cellular phones, PDA, MP3 players, camcorders and other small electronic devices. It is an ideal solution for smart cards applications with rechargeable Li-Ion batteries. Moreover, it is used for secure applications such as SIM card and IC card, whose features include super wide working range, small size and low power consumption.

Working Principle:

The BQ4011YMA-70N Memory device works on the principle of over voltage, over current and double over temperature protection. The circuit consists of a reset circuit, an E2prom, and a watchdog circuit. The reset circuit provides control signals to the E2prom to activate the device and reset it. The E2prom holds all the bits that are written and read to/from the device to carry out the protection functions. The watchdog circuit generates an interrupt signal in the event that the protection threshold is exceeded. This interrupt signal can be used to initiate a reset or an emergency action such as turning the power off. In addition, the circuit includes a charge detection logic circuit which monitors the current in order to control the charging of the Li-Ion batteries.In conclusion, the BQ4011YMA-70N Memory device is a powerful and reliable device that offers excellent protection of the Li-Ion battery in rechargeable applications. The combination of memory, E2prom, and watchdog make it ideal for use in smart card applications. Its unique features such as small size, low power consumption, wide operation range, and high quality offer maximum performance stability and enhanced safety.

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