20 MASK ROM 8

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Part	Manufacturer	Memory IC Type	Temperature Grade	No. of Terminals	Package Code	Package Shape	Package Body Material	Surface Mount	Technology	Terminal Form	Maximum Supply Current	No. of Words	Nominal Supply Voltage / Vsup (V)	Power Supplies (V)	Memory Width	Package Style (Meter)	Package Equivalence Code	Sub-Category	Terminal Pitch	Maximum Operating Temperature	Organization	No. of Words Code	Minimum Operating Temperature	Terminal Position	JESD-30 Code	Qualification	Memory Density	Maximum Time At Peak Reflow Temperature (s)	Peak Reflow Temperature (C)	Maximum Access Time
SN54S371J	Texas Instruments	MASK ROM	MILITARY	20	DIP	RECTANGULAR	CERAMIC	NO	TTL	THROUGH-HOLE	155 mA	256 words	5	5	8	IN-LINE	DIP20,.3	MASK ROMs	2.54 mm	125 Cel	256X8	256	-55 Cel	DUAL	R-XDIP-T20	Not Qualified	2048 bit	NOT SPECIFIED	NOT SPECIFIED	95 ns
SN74S371N	Texas Instruments	MASK ROM	COMMERCIAL	20	DIP	RECTANGULAR	PLASTIC/EPOXY	NO	TTL	THROUGH-HOLE	155 mA	256 words	5	5	8	IN-LINE	DIP20,.3	MASK ROMs	2.54 mm	70 Cel	256X8	256	0 Cel	DUAL	R-PDIP-T20	Not Qualified	2048 bit	NOT SPECIFIED	NOT SPECIFIED	70 ns
SN74S270N	Texas Instruments	MASK ROM	COMMERCIAL	20	DIP	RECTANGULAR	PLASTIC/EPOXY	NO	TTL	THROUGH-HOLE	155 mA	512 words	5	5	4	IN-LINE	DIP20,.3	MASK ROMs	2.54 mm	70 Cel	512X4	512	0 Cel	DUAL	R-PDIP-T20	Not Qualified	2048 bit	NOT SPECIFIED	NOT SPECIFIED	70 ns
SN74S270J	Texas Instruments	MASK ROM	COMMERCIAL	20	DIP	RECTANGULAR	CERAMIC	NO	TTL	THROUGH-HOLE	155 mA	512 words	5	5	4	IN-LINE	DIP20,.3	MASK ROMs	2.54 mm	70 Cel	512X4	512	0 Cel	DUAL	R-XDIP-T20	Not Qualified	2048 bit	NOT SPECIFIED	NOT SPECIFIED	70 ns
SN74S271N	Texas Instruments	MASK ROM	COMMERCIAL	20	DIP	RECTANGULAR	PLASTIC/EPOXY	NO	TTL	THROUGH-HOLE	155 mA	256 words	5	5	8	IN-LINE	DIP20,.3	MASK ROMs	2.54 mm	70 Cel	256X8	256	0 Cel	DUAL	R-PDIP-T20	Not Qualified	2048 bit	NOT SPECIFIED	NOT SPECIFIED	95 ns
SN74S271J	Texas Instruments	MASK ROM	COMMERCIAL	20	DIP	RECTANGULAR	CERAMIC	NO	TTL	THROUGH-HOLE	155 mA	256 words	5	5	8	IN-LINE	DIP20,.3	MASK ROMs	2.54 mm	70 Cel	256X8	256	0 Cel	DUAL	R-XDIP-T20	Not Qualified	2048 bit	NOT SPECIFIED	NOT SPECIFIED	95 ns
SN54S270J	Texas Instruments	MASK ROM	MILITARY	20	DIP	RECTANGULAR	CERAMIC	NO	TTL	THROUGH-HOLE	155 mA	512 words	5	5	4	IN-LINE	DIP20,.3	MASK ROMs	2.54 mm	125 Cel	512X4	512	-55 Cel	DUAL	R-XDIP-T20	Not Qualified	2048 bit	NOT SPECIFIED	NOT SPECIFIED	95 ns
SN74S371J	Texas Instruments	MASK ROM	COMMERCIAL	20	DIP	RECTANGULAR	CERAMIC	NO	TTL	THROUGH-HOLE	155 mA	256 words	5	5	8	IN-LINE	DIP20,.3	MASK ROMs	2.54 mm	70 Cel	256X8	256	0 Cel	DUAL	R-XDIP-T20	Not Qualified	2048 bit	NOT SPECIFIED	NOT SPECIFIED	70 ns

MASK ROM

Mask ROM, or Read-Only Memory, is a type of non-volatile computer memory that is programmed during the manufacturing process. Mask ROM is designed to permanently store data and cannot be reprogrammed after it has been manufactured.

Mask ROM is created by a process known as photolithography. This process involves using a mask, or template, to expose specific areas of a silicon wafer to ultraviolet light. The areas that are exposed to the light are then etched away, leaving behind the patterns that make up the memory cells. Once the memory cells have been created, they are permanently programmed with the data that they will store.

Mask ROM is commonly used in devices that require permanent storage of data, such as game consoles, calculators, and other electronic devices. Because the data is permanently programmed during manufacturing, mask ROM provides a reliable and secure way to store critical data, such as system settings, firmware, and other important information.

One of the advantages of using mask ROM is that it is a cost-effective way to produce large quantities of memory. Because the data is programmed during the manufacturing process, the cost per unit is relatively low compared to other types of non-volatile memory, such as EEPROM or flash memory.