AT28C64B-15PU from Microchip Tech, in a DIP-28-600mil. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin	Name	Type	Function
1	NC	unconnected	No connect pin on the 28-lead PDIP; it has no internal connection.
2	A12	input	Address input; A6 to A12 select the page, and all bytes of a page write must share the same A6 to A12 state on each WE high-to-low transition.
3	A7	input	Address input; part of the A6 to A12 page address that must remain constant during a page write.
4	A6	input	Address input; part of the A6 to A12 page address that must remain constant during a page write.
5	A5	input	Address input; A0 to A5 select which byte within the 64-byte page is written.
6	A4	input	Address input; A0 to A5 select which byte within the 64-byte page is written.
7	A3	input	Address input; A0 to A5 select which byte within the 64-byte page is written.
8	A2	input	Address input; A0 to A5 select which byte within the 64-byte page is written.
9	A1	input	Address input; A0 to A5 select which byte within the 64-byte page is written.
10	A0	input	Address input; A0 to A5 select which byte within the 64-byte page is written.
11	I/O0	bidirectional	Data input/output; outputs go to high impedance when CE or OE is high.
12	I/O1	bidirectional	Data input/output; outputs go to high impedance when CE or OE is high.
13	I/O2	bidirectional	Data input/output; outputs go to high impedance when CE or OE is high.
14	GND	power_in	Ground reference for the device.
15	I/O3	bidirectional	Data input/output; outputs go to high impedance when CE or OE is high.
16	I/O4	bidirectional	Data input/output; outputs go to high impedance when CE or OE is high.
17	I/O5	bidirectional	Data input/output; outputs go to high impedance when CE or OE is high.
18	I/O6	bidirectional	Data input/output; I/O6 toggles during a write cycle and stops when the write completes (toggle bit).
19	I/O7	bidirectional	Data input/output; the complement of written data appears here during a write cycle (DATA Polling) and true data once the write completes.
20	CE	input	Chip enable; CE must be low with OE low and WE high to read, and a high level puts the device in standby with CMOS standby current below 100 µA.
21	A10	input	Address input; A10 is one of the memory address bits.
22	OE	input	Output enable; with CE low and WE high, OE low asserts the addressed data on the outputs, and OE high holds the outputs in high impedance.
23	A11	input	Address input; part of the A6 to A12 page address that must remain constant during a page write.
24	A9	input	Address input; raising A9 to 12.0 V ±0.5 V with addresses 1FC0H to 1FFFH accesses the 64-byte device identification EEPROM, and absolute maximum on A9 is -0.6 V to +13.5 V.
25	A8	input	Address input; part of the A6 to A12 page address that must remain constant during a page write.
26	NC	unconnected	No connect pin on the 28-lead PDIP; it has no internal connection.
27	WE	input	Write enable; a low pulse on WE with CE low and OE high starts a write cycle, and pulses shorter than 15 ns (typical) are filtered out.
28	VCC	power_in	Power supply, 5 V ±10% per the DC and AC operating range.

Key specifications

Parameter	Value
Manufacturer	Microchip Tech
Package	DIP-28-600mil
Category	Memory
Pins	28

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter	Symbol	Min	Typ	Max	Unit	Conditions	Page
Operating Temperature (Case)		-40		85	°C		5
VCC Power Supply	VCC		5		V		5
VCC Power Supply tolerance (5V ±10%)	VCC	-10		10	%		5
VCC Active Current	ICC			40	mA	f = 5 MHz; IOUT = 0 mA	5
VCC Standby Current CMOS	ISB1			100	µA	CE = VCC - 0.3V to VCC + 1V	5
VCC Standby Current TTL	ISB2			2	mA	CE = 2.0V to VCC + 1V	5
Input Load Current	ILI			10	µA	VIN = 0V to VCC + 1V	5
Output Leakage Current	ILO			10	µA	VI/O = 0V to VCC	5
Input Low Voltage	VIL			0.8	V		5
Input High Voltage	VIH	2			V		5
Output Low Voltage	VOL			0.4	V	IOL = 2.1 mA	5
Output High Voltage	VOH	2.4			V	IOH = -400 µA	5
Address to Output Delay (AT28C64B-15)	tACC			150	ns		6
CE to Output Delay (AT28C64B-15)	tCE			150	ns		6
OE to Output Delay (AT28C64B-15)	tOE	0		70	ns		6
CE or OE to Output Float (AT28C64B-15)	tDF	0		50	ns	CL = 5 pF	6
Output Hold from OE, CE or Address, whichever occurred first (AT28C64B-15)	tOH	0			ns		6
Input Pin Capacitance	CIN		4	6	pF	VIN = 0V	7
Output Pin Capacitance	COUT		8	12	pF	VOUT = 0V	7
Address, OE Setup Time	tAS, tOES	0			ns		8
Address Hold Time	tAH	50			ns		8
Chip Select Setup Time	tCS	0			ns		8
Chip Select Hold Time	tCH	0			ns		8
Write Pulse Width (WE or CE)	tWP	100			ns		8
Data Setup Time	tDS	50			ns		8
Data, OE Hold Time	tDH, tOEH	0			ns		8
Write Cycle Time (standard)	tWC			10	ms		9
Byte Load Cycle Time	tBLC			150	µs		9
Write Pulse Width High	tWPH	50			ns		9
Chip Erase Setup Time	tS	1			µs		9
Chip Erase Hold Time	tH	1			µs		9
Chip Erase Write Time	tW	10			ms		9
Data Hold Time (DATA Polling)	tDH	0			ns		11
OE Hold Time (DATA Polling)	tOEH	0			ns		11
Write Recovery Time (DATA Polling)	tWR	0			ns		11
Data Hold Time (Toggle Bit)	tDH	10			ns		11
OE Hold Time (Toggle Bit)	tOEH	10			ns		11
OE High Pulse (Toggle Bit)	tOEHP	150			ns		11
Write Recovery Time (Toggle Bit)	tWR	0			ns		11
Temperature Under Bias		-55		125	°C		5
Storage Temperature		-65		150	°C		5
All Input Voltages (including NC pins) with respect to Ground		-0.6		6.25	V		5
All Output Voltages with respect to Ground		-0.6			V	Maximum printed as VCC + 0.6 V	5
Voltage on OE and A9 with respect to Ground		-0.6		13.5	V		5

CAD (KiCad official)

Symbol: AT28C64B-15PU
Footprint: Package_DIP:DIP-28_W7.62mm
3D model: DIP-28-600mil (KiCad packages3D, STEP)
3D model files: at28c64b-15pu-etched.step / at28c64b-15pu-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); at28c64b-15pu.step / at28c64b-15pu.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

Datasheet: Microchip Tech datasheet (18 pp, sha256 fa7183edcd4cbf3c, retrieved 2026-10-30, tier: manufacturer)
Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-5-5 (text), consensus claude-sonnet-5-5 (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF

AT28C64B-15PU

Verified AT28C64B-15PU

Verification log 1 record

3D Model

Symbol & Footprint

Schematic Symbol

PCB Footprint

Datasheet

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