Datasheet 48L640 (Microchip) - 40

Worldwide Sales and Service AMERICAS ASIA/PACIFIC ASIA/PACIFIC EUROPE Corporate Office Australia - Sydney India - Bangalore Austria - Wels
2355 West Chandler Blvd. Tel: 61-2-9868-6733 Tel: 91-80-3090-4444 Tel: 43-7242-2244-39 Chandler, AZ 85224-6199
China - Beijing India - New Delhi
Fax: 43-7242-2244-393 Tel: 480-792-7200 Tel: 86-10-8569-7000 Tel: 91-11-4160-8631
Denmark - Copenhagen
Fax: 480-792-7277
China - Chengdu India - Pune
Tel: 45-4450-2828 Technical Support: Tel: 86-28-8665-5511 Tel: 91-20-4121-0141 Fax: 45-4485-2829 http://www.micro-
Finland - Espoo
chip.com/support
China - Chongqing Japan - Osaka
Tel: 358-9-4520-820 Web Address: Tel: 86-23-8980-9588 Tel: 81-6-6152-7160 www.microchip.com
China - Dongguan Japan - Tokyo France - Paris
Tel: 86-769-8702-9880 Tel: 81-3-6880- 3770 Tel: 33-1-69-53-63-20
Atlanta
Fax: 33-1-69-30-90-79 Duluth, GA
China - Guangzhou Korea - Daegu
Tel: 678-957-9614 Tel: 86-20-8755-8029 Tel: 82-53-744-4301
Germany - Garching
Fax: 678-957-1455 Tel: 49-8931-9700
China - Hangzhou Korea - Seoul Austin, TX
Tel: 86-571-8792-8115 Tel: 82-2-554-7200
Germany - Haan
Tel: 512-257-3370 Tel: 49-2129-3766400
China - Hong Kong SAR Malaysia - Kuala Lumpur Boston
Tel: 852-2943-5100 Tel: 60-3-7651-7906
Germany - Heilbronn
Westborough, MA Tel: 49-7131-72400
China - Nanjing Malaysia - Penang
Tel: 774-760-0087 Tel: 86-25-8473-2460 Tel: 60-4-227-8870
Germany - Karlsruhe
Fax: 774-760-0088 Tel: 49-721-625370
China - Qingdao Philippines - Manila Chicago
Tel: 86-532-8502-7355 Tel: 63-2-634-9065
Germany - Munich
Itasca, IL Tel: 49-89-627-144-0
China - Shanghai Singapore
Tel: 630-285-0071 Tel: 86-21-3326-8000 Tel: 65-6334-8870 Fax: 49-89-627-144-44 Fax: 630-285-0075
China - Shenyang Taiwan - Hsin Chu Germany - Rosenheim Dallas
Tel: 86-24-2334-2829 Tel: 886-3-577-8366 Tel: 49-8031-354-560 Addison, TX
China - Shenzhen Taiwan - Kaohsiung Israel - Ra’anana
Tel: 972-818-7423 Tel: 86-755-8864-2200 Tel: 886-7-213-7830 Tel: 972-9-744-7705 Fax: 972-818-2924
China - Suzhou Taiwan - Taipei Italy - Milan Detroit
Tel: 86-186-6233-1526 Tel: 886-2-2508-8600 Tel: 39-0331-742611 Novi, MI Fax: 39-0331-466781 Tel: 248-848-4000
China - Wuhan Thailand - Bangkok
Tel: 86-27-5980-5300 Tel: 66-2-694-1351
Italy - Padova Houston, TX
Tel: 39-049-7625286 Tel: 281-894-5983
China - Xian Vietnam - Ho Chi Minh
Tel: 86-29-8833-7252 Tel: 84-28-5448-2100
Netherlands - Drunen Indianapolis
Tel: 31-416-690399 Noblesville, IN
China - Xiamen
Fax: 31-416-690340 Tel: 317-773-8323 Tel: 86-592-2388138
Norway - Trondheim
Fax: 317-773-5453
China - Zhuhai
Tel: 47-7288-4388 Tel: 317-536-2380 Tel: 86-756-3210040
Poland - Warsaw Los Angeles
Tel: 48-22-3325737 Mission Viejo, CA
Romania - Bucharest
Tel: 949-462-9523 Tel: 40-21-407-87-50 Fax: 949-462-9608 Tel: 951-273-7800
Spain - Madrid
Tel: 34-91-708-08-90
Raleigh, NC
Fax: 34-91-708-08-91 Tel: 919-844-7510
Sweden - Gothenberg New York, NY
Tel: 46-31-704-60-40 Tel: 631-435-6000
Sweden - Stockholm San Jose, CA
Tel: 46-8-5090-4654 Tel: 408-735-9110 Tel: 408-436-4270
UK - Wokingham
Tel: 44-118-921-5800
Canada - Toronto
Fax: 44-118-921-5820 Tel: 905-695-1980 Fax: 905-695-2078  2018-2019 Microchip Technology Inc.
Preliminary
DS20006055B-page 40 05/14/19 Document Outline Serial SRAM Features Hidden EEPROM Backup Features Other Features of the 48L640 Packages Package Types (not to scale) Pin Function Table General Description Block Diagram Normal Device Operation Vcc Power-Off Event 1.0 Electrical Characteristics Absolute Maximum Ratings† TABLE 1-1: DC Characteristics TABLE 1-2: AC Characteristics TABLE 1-3: AC Test Conditions 2.0 Pin Descriptions TABLE 2-1: Pin Function Table 2.1 Chip Select (CS) 2.2 Serial Output (SO) 2.3 Serial Input (SI) 2.4 Serial Clock (SCK) 2.5 Hold (HOLD) 3.0 Memory Organization 3.1 Data Array Organization 3.2 16-Bit Nonvolatile User Space 3.3 Device Registers 3.3.1 STATUS Register 4.0 Functional Description FIGURE 4-1: SPI Mode 0 and Mode 3 4.1 Interfacing the 48L640 on the SPI Bus 4.1.1 Selecting the Device 4.1.2 Sending Data to the Device 4.1.3 Receiving Data from the Device 4.2 Device Opcodes 4.2.1 Serial Opcode 4.2.2 Hold Function FIGURE 4-2: Hold Mode 5.0 Write Enable and Disable 5.1 Write Enable Instruction (WREN) FIGURE 5-1: WREN Waveform 5.2 Write Disable Instruction (WRDI) FIGURE 5-2: WRDI Waveform 6.0 STATUS Register 6.1 Block Write-Protect Bits TABLE 6-2: Block Write-Protect Bits 6.2 Write Enable Latch 6.3 Ready/Busy Status Latch 6.4 Read STATUS Register (RDSR) FIGURE 6-1: RDSR Waveform 6.5 Write STATUS Register (WRSR) FIGURE 6-2: WRSR Waveform 7.0 Read Operations 7.1 Reading from the SRAM (READ) FIGURE 7-1: Read SRAM (READ) Waveform 7.2 Read Last Successfully Written Address (RDLSWA) FIGURE 7-2: Read Last Successfully Written Address Waveform 8.0 Write Commands 8.1 Write Instruction Sequences 8.1.1 SRAM Byte Write FIGURE 8-1: SRAM Byte Write Waveform 8.1.2 Continuous Write FIGURE 8-2: Continuous SRAM Write Waveform 9.0 Nonvolatile User Space Access 9.1 Write Nonvolatile User Space (WRNUR) 9.2 Read Nonvolatile User Space (RDNUR) 10.0 Secure Operations 10.1 Secure Write 10.2 Secure Read TABLE 10-1: Secure Write Bits 11.0 Store/Recall Operations 11.1 Automatic Store on Any Power Disruption 11.2 Automatic Recall to SRAM 11.3 Software Store Command FIGURE 11-1: Software Store 11.4 Software Recall Command FIGURE 11-2: Software Recall 11.5 Polling Routine FIGURE 11-3: Polling Flow 12.0 Hibernation FIGURE 12-1: Hibernate Waveform 13.0 Trip Voltage 13.1 Power Switchover 14.0 Packaging Information 14.1 Package Marking Information Product ID System Trademarks Worldwide Sales and Service