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Last update: 15 February 2006

IC number:MSM6242B
IC function:Direct bus connected CMOS real time clock/calendar
Related components:5C01A (RTC used in 32-bit Amigas)

Component documentation
IC numberManufacturerDocumentation
MSM6242BOkiDatasheet (PDF)

Component versions
IC numberPackageCBM part numberCBM part description
MSM6242B18-pin DIP318073-01RealTime Clock Oki MSM6242B
MSM6242B24-pin SOP

Positions
DevicePositionPackage
A2000U65DIP
A2000CRU801DIP
A500 PlusU9DIP
CDTVU61DIP
A501U9DIP
A501 PlusU9 (not installed)DIP
A601U9SOP
PC10-IIIU401DIP

Pinout DIL package
PinTypeNameSignal name
A2000A2000CRA500 Plus, A501CDTVPC10-III
1OutputSTD.PunusedVCC via R411
2Input_CS0_RES via Q9GNDRTCLOCKCS'
3InputALE+5V via Q11+5V+5V via R914+5VD via R95VCC
4..7InputA0..A3A2..A5A2..A5 via U59BADDR0..BADDR3
8Input_RD_CLKRD_CLKRD via U60, U58 and U74NIOR'
9PowerGNDGND
10Input_WR_CLKWR_CLKWR via U60, U58 and U74NIOW'
11..14I/OD3..D0PD3..PD0D0..D3CD0..CD3IDATA0..IDATA3
15InputCS1+5V via R150+5V+5V via R914+5VD via R104VCC
16InputXTconnected to OSC2connected to Y800connected to Y9connected to X2connected to XTAL2
17Output_XT
18PowerVDDconnected to BATconnected to BT800connected to BT9+5VDconnected to BT601

Pinout SOP package
PinTypeName
1OutputSTD.P
2Input_CS0
3N/CNC
4InputALE
5InputA0
6N/CNC
7InputA1
8N/CNC
9..10InputA2..A3
11Input_RD
12PowerGND
13Input_WR
14..16I/OD3..D1
17..18N/CNC
19I/OD0
20InputCS1
21N/CNC
22InputXT
23Output_XT
24PowerVDD

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