Premier Farnell
8bit mcu, 64k flash, 1.8v-5.5v, 645; series:atmega; memory size, flash:64kb; eeprom size:2kb; memory size, ram:4kb; no of i/o lines:53; no. of adc inputs:8; timers, no. of:3; pwm channels, no of:4; clock frequency:8mhz; interface type:jtag, spi, usart; voltage, supply min:1.8v; voltage, supply max:5.5v; termination type:smd; case style:tqfp; no. of pins:64; operating temperature range:-40°c to +85°c; temp, op. max:85°c; temp, op. min:-40°c; base number:645; bits, number in timer:16; bits, number in adc:10; ic generic number:645; interrupts, external no. of:17; logic function number:645; memory size:64 k; memory size, program memory:64kb; memory type:flash; no. of bits:8; no. of inputs:53; no. of outputs:53; oscillator type:rc oscillator; packaging type:peel pack
http://grh.premierfarnell.com/grh.aspx?mid=1000082&sku=ATMEG... Newark
8bit mcu, 64k flash, 1.8v-5.5v, 645; series:atmega; memory size, flash:64kb; eeprom size:2kb; memory size, ram:4kb; no of i/o lines:53; no. of adc inputs:8; timers, no. of:3; pwm channels, no of:4; clock frequency:8mhz; interface ;rohs compliant: yes
http://www.newark.com/jsp/search/productdetail.jsp?SKU=23M50... 
