Part number	Datasheet
Farnell: 1081890	Zilog, Z84C00
Mouser: 692-Z84C0008PEG	Zilog, Z84C00
RS: 625-8918	Zilog, Z84C00

The above part is rated at a clock speed of 8 MHz but a faster part, such as the 10MHz part shown below, can be used instead.

Part number	Datasheet
Farnell: 1081891	Zilog, Z84C00
Mouser: 692-Z84C0010PEG	Zilog, Z84C00
RS: 625-9078	Zilog, Z84C00

Further information can be found in the Z80 User Manual – Zilog – UM0080